Add support for python 3.10 (#403)

* Add support for python 3.10

* Update tox.ini

* Update test.yml

Author: jackton1

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
       fail-fast: true
       matrix:
         platform: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.6, 3.7, 3.8, 3.9, '3.10.0-beta.1']
 
     steps:
       - uses: actions/checkout@v2

setup.py

@@ -86,6 +86,7 @@
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
         "Framework :: Django :: 1.11",
         "Framework :: Django :: 2.0",
         "Framework :: Django :: 2.1",

tox.ini

@@ -9,6 +9,7 @@ envlist =
     py37-django{11,20,21,22,30,31,32,main}-{linux,macos,windows}
     py38-django{11,20,21,22,30,31,32,main}-{linux,macos,windows}
     py39-django{11,20,21,22,30,31,32,main}-{linux,macos,windows}
+    py310-django{11,20,21,22,30,31,32,main}-{linux,macos,windows}
 skip_missing_interpreters = true
 
 [gh-actions]
@@ -18,6 +19,7 @@ python =
     3.7: py37
     3.8: py38
     3.9: py39
+    3.10: py310
 
 [gh-actions:env]
 PLATFORM =