diff --git a/Pipfile.lock b/Pipfile.lock
index e5f01a6..cebab1a 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -3,19 +3,6 @@
         "hash": {
             "sha256": "1be7ceaeda387a78eef0e3b43b1ec7069a02e73a097dea26dd146f7cdc4d9fe4"
         },
-        "host-environment-markers": {
-            "implementation_name": "cpython",
-            "implementation_version": "3.6.1",
-            "os_name": "posix",
-            "platform_machine": "x86_64",
-            "platform_python_implementation": "CPython",
-            "platform_release": "17.5.0",
-            "platform_system": "Darwin",
-            "platform_version": "Darwin Kernel Version 17.5.0: Mon Mar  5 22:24:32 PST 2018; root:xnu-4570.51.1~1/RELEASE_X86_64",
-            "python_full_version": "3.6.1",
-            "python_version": "3.6",
-            "sys_platform": "darwin"
-        },
         "pipfile-spec": 6,
         "requires": {},
         "sources": [
@@ -27,18 +14,27 @@
         ]
     },
     "default": {
+        "gitdb": {
+            "hashes": [
+                "sha256:6c4cc71933456991da20917998acbe6cf4fb41eeaab7d6d67fbc05ecd4c865b0",
+                "sha256:96bf5c08b157a666fec41129e6d327235284cca4c81e92109260f353ba138005"
+            ],
+            "markers": "python_version >= '3.4'",
+            "version": "==4.0.7"
+        },
         "gitdb2": {
             "hashes": [
-                "sha256:cf9a4b68e8c4da8d42e48728c944ff7af2d8c9db303ac1ab32eac37aa4194b0e",
-                "sha256:b60e29d4533e5e25bb50b7678bbc187c8f6bcff1344b4f293b2ba55c85795f09"
+                "sha256:0986cb4003de743f2b3aba4c828edd1ab58ce98e1c4a8acf72ef02760d4beb4e",
+                "sha256:a1c974e5fab8c2c90192c1367c81cbc54baec04244bda1816e9c8ab377d1cba3"
             ],
-            "version": "==2.0.3"
+            "version": "==4.0.2"
         },
         "gitpython": {
             "hashes": [
                 "sha256:05069e26177c650b3cb945dd543a7ef7ca449f8db5b73038b465105673c1ef61",
                 "sha256:c47cc31af6e88979c57a33962cbc30a7c25508d74a1b3a19ec5aa7ed64b03129"
             ],
+            "index": "pypi",
             "version": "==2.1.9"
         },
         "mccabe": {
@@ -46,6 +42,7 @@
                 "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
                 "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"
             ],
+            "index": "pypi",
             "version": "==0.6.1"
         },
         "pep8": {
@@ -53,185 +50,231 @@
                 "sha256:b22cfae5db09833bb9bd7c8463b53e1a9c9b39f12e304a8d0bba729c501827ee",
                 "sha256:fe249b52e20498e59e0b5c5256aa52ee99fc295b26ec9eaa85776ffdb9fe6374"
             ],
+            "index": "pypi",
             "version": "==1.7.1"
         },
-        "smmap2": {
+        "smmap": {
             "hashes": [
-                "sha256:b78ee0f1f5772d69ff50b1cbdb01b8c6647a8354f02f23b488cf4b2cfc923956",
-                "sha256:c7530db63f15f09f8251094b22091298e82bf6c699a6b8344aaaef3f2e1276c3"
+                "sha256:7e65386bd122d45405ddf795637b7f7d2b532e7e401d46bbe3fb49b9986d5182",
+                "sha256:a9a7479e4c572e2e775c404dcd3080c8dc49f39918c2cf74913d30c4c478e3c2"
             ],
-            "version": "==2.0.3"
+            "markers": "python_version >= '3.5'",
+            "version": "==4.0.0"
         },
         "stdlib-list": {
             "hashes": [
-                "sha256:3f6cafd9a2e86b22d475a52433d95143c1ee64c02b73d403c6ef6df38ce3f8fd",
-                "sha256:18a0bd3a89a53d2a3dfb57c0af0b0b86243eb59a570992bc9f6fde1b8019f53d"
+                "sha256:18a0bd3a89a53d2a3dfb57c0af0b0b86243eb59a570992bc9f6fde1b8019f53d",
+                "sha256:3f6cafd9a2e86b22d475a52433d95143c1ee64c02b73d403c6ef6df38ce3f8fd"
             ],
+            "index": "pypi",
             "version": "==0.4.0"
         }
     },
     "develop": {
         "attrs": {
             "hashes": [
-                "sha256:a17a9573a6f475c99b551c0e0a812707ddda1ec9653bed04c13841404ed6f450",
-                "sha256:1c7960ccfd6a005cd9f7ba884e6316b5e430a3f1a6c37c5f87d8b43f83b54ec9"
+                "sha256:149e90d6d8ac20db7a955ad60cf0e6881a3f20d37096140088356da6c716b0b1",
+                "sha256:ef6aaac3ca6cd92904cdd0d83f629a15f18053ec84e6432106f7a4d04ae4f5fb"
             ],
-            "version": "==17.4.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==21.2.0"
         },
         "babel": {
             "hashes": [
-                "sha256:ad209a68d7162c4cff4b29cdebe3dec4cef75492df501b0049a9433c96ce6f80",
-                "sha256:8ce4cb6fdd4393edd323227cba3a077bceb2a6ce5201c902c65e730046f41f14"
+                "sha256:ab49e12b91d937cd11f0b67cb259a57ab4ad2b59ac7a3b41d6c06c0ac5b0def9",
+                "sha256:bc0c176f9f6a994582230df350aa6e05ba2ebe4b3ac317eab29d9be5d2768da0"
             ],
-            "version": "==2.5.3"
+            "index": "pypi",
+            "version": "==2.9.1"
+        },
+        "backports.entry-points-selectable": {
+            "hashes": [
+                "sha256:988468260ec1c196dab6ae1149260e2f5472c9110334e5d51adcb77867361f6a",
+                "sha256:a6d9a871cde5e15b4c4a53e3d43ba890cc6861ec1332c9c2428c92f977192acc"
+            ],
+            "markers": "python_version >= '2.7'",
+            "version": "==1.1.0"
         },
         "certifi": {
             "hashes": [
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-                "sha256:edbc3f203427eef571f79a7692bb160a2b0f7ccaa31953e99bd17e307cf63f7d"
+                "sha256:78884e7c1d4b00ce3cea67b44566851c4343c120abd683433ce934a68ea58872",
+                "sha256:d62a0163eb4c2344ac042ab2bdf75399a71a2d8c7d47eac2e2ee91b9d6339569"
             ],
-            "version": "==2018.1.18"
+            "version": "==2021.10.8"
         },
-        "chardet": {
+        "charset-normalizer": {
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-                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae"
+                "sha256:e019de665e2bcf9c2b64e2e5aa025fa991da8720daa3c1138cadd2fd1856aed0",
+                "sha256:f7af805c321bfa1ce6714c51f254e0d5bb5e5834039bc17db7ebe3a4cec9492b"
             ],
-            "version": "==3.0.4"
+            "markers": "python_version >= '3'",
+            "version": "==2.0.7"
         },
         "codecov": {
             "hashes": [
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-                "sha256:8ed8b7c6791010d359baed66f84f061bba5bd41174bf324c31311e8737602788"
+                "sha256:8ed8b7c6791010d359baed66f84f061bba5bd41174bf324c31311e8737602788",
+                "sha256:ae00d68e18d8a20e9c3288ba3875ae03db3a8e892115bf9b83ef20507732bed4"
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+            "index": "pypi",
             "version": "==2.0.15"
         },
         "coverage": {
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-            "version": "==2.6"
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+            "version": "==3.3"
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+            "markers": "python_version >= '3.6'",
+            "version": "==2.4.0"
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         "pluggy": {
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+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
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         "py": {
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             ],
-            "version": "==1.5.3"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==1.10.0"
         },
         "pytest": {
             "hashes": [
                 "sha256:6266f87ab64692112e5477eba395cfedda53b1933ccd29478e671e73b420c19c",
                 "sha256:fae491d1874f199537fd5872b5e1f0e74a009b979df9d53d1553fd03da1703e1"
             ],
+            "index": "pypi",
             "version": "==3.5.0"
         },
         "pytest-cov": {
             "hashes": [
-                "sha256:890fe5565400902b0c78b5357004aab1c814115894f4f21370e2433256a3eeec",
-                "sha256:03aa752cf11db41d281ea1d807d954c4eda35cfa1b21d6971966cc041bbf6e2d"
+                "sha256:03aa752cf11db41d281ea1d807d954c4eda35cfa1b21d6971966cc041bbf6e2d",
+                "sha256:890fe5565400902b0c78b5357004aab1c814115894f4f21370e2433256a3eeec"
             ],
+            "index": "pypi",
             "version": "==2.5.1"
         },
         "pytz": {
             "hashes": [
-                "sha256:65ae0c8101309c45772196b21b74c46b2e5d11b6275c45d251b150d5da334555",
-                "sha256:c06425302f2cf668f1bba7a0a03f3c1d34d4ebeef2c72003da308b3947c7f749"
+                "sha256:3672058bc3453457b622aab7a1c3bfd5ab0bdae451512f6cf25f64ed37f5b87c",
+                "sha256:acad2d8b20a1af07d4e4c9d2e9285c5ed9104354062f275f3fcd88dcef4f1326"
             ],
-            "version": "==2018.4"
+            "version": "==2021.3"
         },
         "requests": {
             "hashes": [
-                "sha256:6a1b267aa90cac58ac3a765d067950e7dbbf75b1da07e895d1f594193a40a38b",
-                "sha256:9c443e7324ba5b85070c4a818ade28bfabedf16ea10206da1132edaa6dda237e"
+                "sha256:6c1246513ecd5ecd4528a0906f910e8f0f9c6b8ec72030dc9fd154dc1a6efd24",
+                "sha256:b8aa58f8cf793ffd8782d3d8cb19e66ef36f7aba4353eec859e74678b01b07a7"
             ],
-            "version": "==2.18.4"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4, 3.5'",
+            "version": "==2.26.0"
         },
         "six": {
             "hashes": [
-                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb",
-                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9"
+                "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
+                "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
             ],
-            "version": "==1.11.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==1.16.0"
         },
         "tox": {
             "hashes": [
-                "sha256:9ee7de958a43806402a38c0d2aa07fa8553f4d2c20a15b140e9f771c2afeade0",
-                "sha256:96efa09710a3daeeb845561ebbe1497641d9cef2ee0aea30db6969058b2bda2f"
+                "sha256:96efa09710a3daeeb845561ebbe1497641d9cef2ee0aea30db6969058b2bda2f",
+                "sha256:9ee7de958a43806402a38c0d2aa07fa8553f4d2c20a15b140e9f771c2afeade0"
             ],
+            "index": "pypi",
             "version": "==3.0.0"
         },
         "urllib3": {
             "hashes": [
-                "sha256:06330f386d6e4b195fbfc736b297f58c5a892e4440e54d294d7004e3a9bbea1b",
-                "sha256:cc44da8e1145637334317feebd728bd869a35285b93cbb4cca2577da7e62db4f"
+                "sha256:4987c65554f7a2dbf30c18fd48778ef124af6fab771a377103da0585e2336ece",
+                "sha256:c4fdf4019605b6e5423637e01bc9fe4daef873709a7973e195ceba0a62bbc844"
             ],
-            "version": "==1.22"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'",
+            "version": "==1.26.7"
         },
         "virtualenv": {
             "hashes": [
-                "sha256:e8e05d4714a1c51a2f5921e62f547fcb0f713ebbe959e0a7f585cc8bef71d11f",
-                "sha256:1d7e241b431e7afce47e77f8843a276f652699d1fa4f93b9d8ce0076fd7b0b54"
+                "sha256:10062e34c204b5e4ec5f62e6ef2473f8ba76513a9a617e873f1f8fb4a519d300",
+                "sha256:bcc17f0b3a29670dd777d6f0755a4c04f28815395bca279cdcb213b97199a6b8"
             ],
-            "version": "==15.2.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==20.8.1"
         }
     }
 }
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 9368082..03de3a6 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,18 +1,40 @@
-attrs==17.4.0 --hash=sha256:a17a9573a6f475c99b551c0e0a812707ddda1ec9653bed04c13841404ed6f450  --hash=sha256:1c7960ccfd6a005cd9f7ba884e6316b5e430a3f1a6c37c5f87d8b43f83b54ec9
-babel==2.5.3 --hash=sha256:ad209a68d7162c4cff4b29cdebe3dec4cef75492df501b0049a9433c96ce6f80  --hash=sha256:8ce4cb6fdd4393edd323227cba3a077bceb2a6ce5201c902c65e730046f41f14
-certifi==2018.1.18 --hash=sha256:14131608ad2fd56836d33a71ee60fa1c82bc9d2c8d98b7bdbc631fe1b3cd1296  --hash=sha256:edbc3f203427eef571f79a7692bb160a2b0f7ccaa31953e99bd17e307cf63f7d
-chardet==3.0.4 --hash=sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691  --hash=sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae
-codecov==2.0.15 --hash=sha256:ae00d68e18d8a20e9c3288ba3875ae03db3a8e892115bf9b83ef20507732bed4  --hash=sha256:8ed8b7c6791010d359baed66f84f061bba5bd41174bf324c31311e8737602788
-coverage==4.5.1 --hash=sha256:7608a3dd5d73cb06c531b8925e0ef8d3de31fed2544a7de6c63960a1e73ea4bc  --hash=sha256:3a2184c6d797a125dca8367878d3b9a178b6fdd05fdc2d35d758c3006a1cd694  --hash=sha256:f3f501f345f24383c0000395b26b726e46758b71393267aeae0bd36f8b3ade80  --hash=sha256:0b136648de27201056c1869a6c0d4e23f464750fd9a9ba9750b8336a244429ed  --hash=sha256:337ded681dd2ef9ca04ef5d93cfc87e52e09db2594c296b4a0a3662cb1b41249  --hash=sha256:3eb42bf89a6be7deb64116dd1cc4b08171734d721e7a7e57ad64cc4ef29ed2f1  --hash=sha256:be6cfcd8053d13f5f5eeb284aa8a814220c3da1b0078fa859011c7fffd86dab9  --hash=sha256:69bf008a06b76619d3c3f3b1983f5145c75a305a0fea513aca094cae5c40a8f5  --hash=sha256:2eb564bbf7816a9d68dd3369a510be3327f1c618d2357fa6b1216994c2e3d508  --hash=sha256:9d6dd10d49e01571bf6e147d3b505141ffc093a06756c60b053a859cb2128b1f  --hash=sha256:701cd6093d63e6b8ad7009d8a92425428bc4d6e7ab8d75efbb665c806c1d79ba  --hash=sha256:5a13ea7911ff5e1796b6d5e4fbbf6952381a611209b736d48e675c2756f3f74e  --hash=sha256:c1bb572fab8208c400adaf06a8133ac0712179a334c09224fb11393e920abcdd  --hash=sha256:03481e81d558d30d230bc12999e3edffe392d244349a90f4ef9b88425fac74ba  --hash=sha256:28b2191e7283f4f3568962e373b47ef7f0392993bb6660d079c62bd50fe9d162  --hash=sha256:de4418dadaa1c01d497e539210cb6baa015965526ff5afc078c57ca69160108d  --hash=sha256:8c3cb8c35ec4d9506979b4cf90ee9918bc2e49f84189d9bf5c36c0c1119c6558  --hash=sha256:7e1fe19bd6dce69d9fd159d8e4a80a8f52101380d5d3a4d374b6d3eae0e5de9c  --hash=sha256:6bc583dc18d5979dc0f6cec26a8603129de0304d5ae1f17e57a12834e7235062  --hash=sha256:198626739a79b09fa0a2f06e083ffd12eb55449b5f8bfdbeed1df4910b2ca640  --hash=sha256:7aa36d2b844a3e4a4b356708d79fd2c260281a7390d678a10b91ca595ddc9e99  --hash=sha256:3d72c20bd105022d29b14a7d628462ebdc61de2f303322c0212a054352f3b287  --hash=sha256:4635a184d0bbe537aa185a34193898eee409332a8ccb27eea36f262566585000  --hash=sha256:e05cb4d9aad6233d67e0541caa7e511fa4047ed7750ec2510d466e806e0255d6  --hash=sha256:76ecd006d1d8f739430ec50cc872889af1f9c1b6b8f48e29941814b09b0fd3cc  --hash=sha256:7d3f553904b0c5c016d1dad058a7554c7ac4c91a789fca496e7d8347ad040653  --hash=sha256:3c79a6f7b95751cdebcd9037e4d06f8d5a9b60e4ed0cd231342aa8ad7124882a  --hash=sha256:56e448f051a201c5ebbaa86a5efd0ca90d327204d8b059ab25ad0f35fbfd79f1  --hash=sha256:ac4fef68da01116a5c117eba4dd46f2e06847a497de5ed1d64bb99a5fda1ef91  --hash=sha256:1c383d2ef13ade2acc636556fd544dba6e14fa30755f26812f54300e401f98f2  --hash=sha256:b8815995e050764c8610dbc82641807d196927c3dbed207f0a079833ffcf588d  --hash=sha256:104ab3934abaf5be871a583541e8829d6c19ce7bde2923b2751e0d3ca44db60a  --hash=sha256:9e112fcbe0148a6fa4f0a02e8d58e94470fc6cb82a5481618fea901699bf34c4  --hash=sha256:15b111b6a0f46ee1a485414a52a7ad1d703bdf984e9ed3c288a4414d3871dcbd  --hash=sha256:e4d96c07229f58cb686120f168276e434660e4358cc9cf3b0464210b04913e77  --hash=sha256:f8a923a85cb099422ad5a2e345fe877bbc89a8a8b23235824a93488150e45f6e
-idna==2.6 --hash=sha256:8c7309c718f94b3a625cb648ace320157ad16ff131ae0af362c9f21b80ef6ec4  --hash=sha256:2c6a5de3089009e3da7c5dde64a141dbc8551d5b7f6cf4ed7c2568d0cc520a8f
-more-itertools==4.1.0 --hash=sha256:11a625025954c20145b37ff6309cd54e39ca94f72f6bb9576d1195db6fa2442e  --hash=sha256:0dd8f72eeab0d2c3bd489025bb2f6a1b8342f9b198f6fc37b52d15cfa4531fea  --hash=sha256:c9ce7eccdcb901a2c75d326ea134e0886abfbea5f93e91cc95de9507c0816c44
-pluggy==0.6.0 --hash=sha256:d345c8fe681115900d6da8d048ba67c25df42973bda370783cd58826442dcd7c  --hash=sha256:e160a7fcf25762bb60efc7e171d4497ff1d8d2d75a3d0df7a21b76821ecbf5c5  --hash=sha256:7f8ae7f5bdf75671a718d2daf0a64b7885f74510bcd98b1a0bb420eb9a9d0cff
-py==1.5.3 --hash=sha256:983f77f3331356039fdd792e9220b7b8ee1aa6bd2b25f567a963ff1de5a64f6a  --hash=sha256:29c9fab495d7528e80ba1e343b958684f4ace687327e6f789a94bf3d1915f881
-pytest==3.5.0 --hash=sha256:6266f87ab64692112e5477eba395cfedda53b1933ccd29478e671e73b420c19c  --hash=sha256:fae491d1874f199537fd5872b5e1f0e74a009b979df9d53d1553fd03da1703e1
-pytest-cov==2.5.1 --hash=sha256:890fe5565400902b0c78b5357004aab1c814115894f4f21370e2433256a3eeec  --hash=sha256:03aa752cf11db41d281ea1d807d954c4eda35cfa1b21d6971966cc041bbf6e2d
-pytz==2018.4 --hash=sha256:65ae0c8101309c45772196b21b74c46b2e5d11b6275c45d251b150d5da334555  --hash=sha256:c06425302f2cf668f1bba7a0a03f3c1d34d4ebeef2c72003da308b3947c7f749
-requests==2.18.4 --hash=sha256:6a1b267aa90cac58ac3a765d067950e7dbbf75b1da07e895d1f594193a40a38b  --hash=sha256:9c443e7324ba5b85070c4a818ade28bfabedf16ea10206da1132edaa6dda237e
-six==1.11.0 --hash=sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb  --hash=sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9
-tox==3.0.0 --hash=sha256:9ee7de958a43806402a38c0d2aa07fa8553f4d2c20a15b140e9f771c2afeade0  --hash=sha256:96efa09710a3daeeb845561ebbe1497641d9cef2ee0aea30db6969058b2bda2f
-urllib3==1.22 --hash=sha256:06330f386d6e4b195fbfc736b297f58c5a892e4440e54d294d7004e3a9bbea1b  --hash=sha256:cc44da8e1145637334317feebd728bd869a35285b93cbb4cca2577da7e62db4f
-virtualenv==15.2.0 --hash=sha256:e8e05d4714a1c51a2f5921e62f547fcb0f713ebbe959e0a7f585cc8bef71d11f  --hash=sha256:1d7e241b431e7afce47e77f8843a276f652699d1fa4f93b9d8ce0076fd7b0b54
+#
+# These requirements were autogenerated by pipenv
+# To regenerate from the project's Pipfile, run:
+#
+#    pipenv lock --requirements --dev
+#
+
+# Note: in pipenv 2020.x, "--dev" changed to emit both default and development
+# requirements. To emit only development requirements, pass "--dev-only".
+
+-i https://pypi.python.org/simple/
+attrs==21.2.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
+babel==2.9.1
+backports.entry-points-selectable==1.1.0; python_version >= '2.7'
+certifi==2021.10.8
+charset-normalizer==2.0.7; python_version >= '3'
+codecov==2.0.15
+coverage==6.0.2; python_version >= '3.6'
+distlib==0.3.3
+filelock==3.3.1; python_version >= '3.6'
+gitdb2==4.0.2
+gitdb==4.0.7; python_version >= '3.4'
+gitpython==2.1.9
+idna==3.3; python_version >= '3'
+mccabe==0.6.1
+more-itertools==8.10.0; python_version >= '3.5'
+pep8==1.7.1
+platformdirs==2.4.0; python_version >= '3.6'
+pluggy==0.6.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+py==1.10.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+pytest-cov==2.5.1
+pytest==3.5.0
+pytz==2021.3
+requests==2.26.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4, 3.5'
+six==1.16.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+smmap==4.0.0; python_version >= '3.5'
+stdlib-list==0.4.0
+tox==3.0.0
+urllib3==1.26.7; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'
+virtualenv==20.8.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
diff --git a/requirements.txt b/requirements.txt
index da848d3..d83e52b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,15 @@
-gitdb2==2.0.3 --hash=sha256:cf9a4b68e8c4da8d42e48728c944ff7af2d8c9db303ac1ab32eac37aa4194b0e  --hash=sha256:b60e29d4533e5e25bb50b7678bbc187c8f6bcff1344b4f293b2ba55c85795f09
-gitpython==2.1.9 --hash=sha256:05069e26177c650b3cb945dd543a7ef7ca449f8db5b73038b465105673c1ef61  --hash=sha256:c47cc31af6e88979c57a33962cbc30a7c25508d74a1b3a19ec5aa7ed64b03129
-mccabe==0.6.1 --hash=sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42  --hash=sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f
-pep8==1.7.1 --hash=sha256:b22cfae5db09833bb9bd7c8463b53e1a9c9b39f12e304a8d0bba729c501827ee  --hash=sha256:fe249b52e20498e59e0b5c5256aa52ee99fc295b26ec9eaa85776ffdb9fe6374
-smmap2==2.0.3 --hash=sha256:b78ee0f1f5772d69ff50b1cbdb01b8c6647a8354f02f23b488cf4b2cfc923956  --hash=sha256:c7530db63f15f09f8251094b22091298e82bf6c699a6b8344aaaef3f2e1276c3
-stdlib-list==0.4.0 --hash=sha256:3f6cafd9a2e86b22d475a52433d95143c1ee64c02b73d403c6ef6df38ce3f8fd  --hash=sha256:18a0bd3a89a53d2a3dfb57c0af0b0b86243eb59a570992bc9f6fde1b8019f53d
+#
+# These requirements were autogenerated by pipenv
+# To regenerate from the project's Pipfile, run:
+#
+#    pipenv lock --requirements
+#
+
+-i https://pypi.python.org/simple/
+gitdb2==4.0.2
+gitdb==4.0.7; python_version >= '3.4'
+gitpython==2.1.9
+mccabe==0.6.1
+pep8==1.7.1
+smmap==4.0.0; python_version >= '3.5'
+stdlib-list==0.4.0