Add Django 3.2 support

tox.ini

@@ -3,7 +3,7 @@ envlist =
     py27-django111
     py{35,36,37,38}-django{111,20,21}
     py{35,36,37,38,39}-django22
-    py{36,37,38,39}-django{30,31}
+    py{36,37,38,39}-django{30,31,32}
     lint
 
 [gh-actions]
@@ -26,6 +26,7 @@ deps =
     django22: django>=2.2,<2.3
     django30: django>=3.0,<3.1
     django31: django>=3.1,<3.2
+    django32: django>=3.2,<3.3
 
 [testenv:lint]
 basepython = python3.6