Add Django main to test pipeline.

auditlog_tests/tests.py

@@ -209,7 +209,10 @@ class MiddlewareTest(TestCase):
     """
 
     def setUp(self):
-        self.middleware = AuditlogMiddleware()
+        def get_response(request):
+            return HttpResponse()
+
+        self.middleware = AuditlogMiddleware(get_response)
         self.factory = RequestFactory()
         self.user = User.objects.create_user(
             username="test", email="test@example.com", password="top_secret"

tox.ini

@@ -2,6 +2,7 @@
 envlist =
     {py37,py38,py39}-django{22,31}
     {py37,py38,py39,py10}-django32
+    {py38,py39,py10}-djangomain
     py38-docs
     py38-qa
 
@@ -13,6 +14,7 @@ deps =
     django22: Django>=2.2,<2.3
     django31: Django>=3.1,<3.2
     django32: Django>=3.2,<3.3
+    djangomain: https://github.com/django/django/archive/main.tar.gz
     # Test requirements
     coverage
     codecov