Support Django 4.0

Author: Suor

setup.py

@@ -49,6 +49,7 @@
         'Framework :: Django :: 3.0',
         'Framework :: Django :: 3.1',
         'Framework :: Django :: 3.2',
+        'Framework :: Django :: 4.0',
 
         'Environment :: Web Environment',
         'Intended Audience :: Developers',

tox.ini

@@ -32,7 +32,7 @@ deps =
     dj30: Django>=3.0,<3.1
     dj31: Django>=3.1,<3.2
     dj32: Django>=3.2,<3.3
-    dj40: Django>=4.0a,<4.1
+    dj40: Django>=4.0,<4.1
     djmaster: git+https://github.com/django/django
     mysqlclient
     py{35,36,37,38,39,310}: psycopg2-binary