Add 3.10 to tox.ini and setup.py

Author: tomchristie

setup.py

@@ -99,11 +99,11 @@ def get_version(package):
         'Operating System :: OS Independent',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3 :: Only',
         'Topic :: Internet :: WWW/HTTP',
     ],

tox.ini

@@ -2,8 +2,8 @@
 envlist =
        {py35,py36,py37}-django22,
        {py36,py37,py38,py39}-django31,
-       {py36,py37,py38,py39}-django32,
-       {py38,py39}-{django40,djangomain},
+       {py36,py37,py38,py39,py310}-django32,
+       {py38,py39,py310}-{django40,djangomain},
        base,dist,docs,
 
 [travis:env]
@@ -54,3 +54,6 @@ ignore_outcome = true
 
 [testenv:py39-djangomain]
 ignore_outcome = true
+
+[testenv:py310-djangomain]
+ignore_outcome = true