Test on Django 3.2, stable and main branch

tox.ini

@@ -2,7 +2,7 @@
 skipsdist = True
 usedevelop = True
 
-envlist = py{36,37,38,39}-dj{22,30,31,31stable,master}-{sqlite,postgres,mysql,mssql}-{elasticsearch7,elasticsearch6,elasticsearch5,noelasticsearch}-{customuser,emailuser}-{tz,notz},
+envlist = py{36,37,38,39}-dj{22,30,31,32,32stable,main}-{sqlite,postgres,mysql,mssql}-{elasticsearch7,elasticsearch6,elasticsearch5,noelasticsearch}-{customuser,emailuser}-{tz,notz},
 
 [testenv]
 install_command = pip install -e ".[testing]" -U {opts} {packages}
@@ -22,11 +22,12 @@ deps =
     django-sendfile==0.3.6
     Embedly
 
-    dj22: Django>=2.2,<2.3
-    dj30: Django>=3.0,<3.1
-    dj31: Django>=3.1,<3.2
-    dj31stable: git+https://github.com/django/django.git@stable/3.1.x#egg=Django
-    djmaster: git+https://github.com/django/django.git@master#egg=Django
+    dj22: Django~=2.2.0
+    dj30: Django~=3.0.0
+    dj31: Django~=3.1.0
+    dj32: Django~=3.2.0
+    dj32stable: git+https://github.com/django/django.git@stable/3.2.x#egg=Django
+    djmain: git+https://github.com/django/django.git@main#egg=Django
 
     postgres: psycopg2>=2.6
     mysql: mysqlclient>=1.4,<2