Align GH workflow, tox and package metadata to supported Python versions

Signed-off-by: Ievgen Popovych <[email protected]>

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
       runs-on: ${{ matrix.os }}
       strategy:
         matrix:
-          python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
+          python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
           os: [ubuntu-latest, windows-latest]
 
       steps:

pyproject.toml

@@ -11,13 +11,13 @@ requires = [
     "pyyaml"
 ]
 description-file = "README.rst"
-requires-python = ">=3.6"
+requires-python = ">=3.8"
 classifiers = [
     'Intended Audience :: Developers',
     'License :: OSI Approved :: MIT License',
-    'Programming Language :: Python :: 3.6',
-    'Programming Language :: Python :: 3.7',
     'Programming Language :: Python :: 3.8',
     'Programming Language :: Python :: 3.9',
     'Programming Language :: Python :: 3.10',
+    'Programming Language :: Python :: 3.11',
+    'Programming Language :: Python :: 3.12',
 ]

setup.cfg

@@ -4,7 +4,7 @@ logging-clear-handlers=1
 eval-attr="!=slow"
 
 [flake8]
-min-version=3.6
+min-version=3.8
 # Default pyflakes errors we ignore:
 # - E241: missing whitespace after ',' (used to align visually)
 # - E221: multiple spaces before operator (used to align visually)

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py{36,37,38}-test, py38-flake8, docs
+envlist = py{38,39,310,311,312}-test, py312-flake8, docs
 isolated_build = True
 
 [tox:.package]
@@ -26,11 +26,11 @@ files = example confuse test docs
 [testenv]
 deps =
     {test,cov}: {[_test]deps}
-    py{36,37,38}-flake8: {[_flake8]deps}
+    py{38,39,310,311,312}-flake8: {[_flake8]deps}
 commands =
     cov: nose2 --with-coverage {posargs}
     test: nose2 {posargs}
-    py36-flake8: flake8 --min-version 3.6 {posargs} {[_flake8]files}
+    py38-flake8: flake8 --min-version 3.8 {posargs} {[_flake8]files}
 
 [testenv:docs]
 deps =