Add Django 4.1 and Python 3.11 to test matrix, remove Django 2.2 and …

…Python 3.6

.github/workflows/ci.yml

@@ -9,15 +9,17 @@ jobs:
 
     strategy:
       matrix:
-        python: ["3.6", "3.7", "3.8", "3.9", "3.10"]
-        django: ["2.2", "3.2", "4.0"]
+        python: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        django: ["3.2", "4.0", "4.1"]
         exclude:
           - python: "3.6"
             django: "4.0"
           - python: "3.7"
             django: "4.0"
-          - python: "3.10"
-            django: "2.2"
+          - python: "3.6"
+            django: "4.1"
+          - python: "3.7"
+            django: "4.1"
 
     steps:
     - uses: actions/checkout@v2