chore: Update test matrix (add django 4) (#625)

.github/workflows/github-actions.yml

@@ -30,9 +30,12 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: [3.6, 3.7, 3.8, 3.9]
-        django: [2.2, 3.0, 3.2]
+        python: [3.7, 3.8, 3.9]
+        django: [2.2, 3.2]
         database: ["sqlite", "postgres", "mysql"]
+        include:
+          - python-version: "3.9"
+            django: "4.0"
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       DJANGO: ${{ matrix.django }}

tox.ini

@@ -7,9 +7,9 @@ exclude = .tox
 distribute = False
 envlist =
     py{36,37,38,39}-2.2,
-    py{36,37,38,39}-3.0,
-    py{36,37,38,39}-3.1,
     py{36,37,38,39}-3.2,
+    py{37,38,39}-4.0,
+    py{37,38,39}-4.1,
 
 [testenv]
 downloadcache = {toxworkdir}/_download/
@@ -23,8 +23,8 @@ basepython =
     py39: python3.9
 deps =
     2.2: Django==2.2.*
-    3.0: Django>=3.0a1,<3.1
-    3.1: Django>=3.1,<3.2
-    3.2: Django>=3.2,<4.0
+    3.2: Django==3.2.*
+    4.0: Django==4.0.*
+    4.1: Django==4.1.*
     Pillow
     six