Mark support for Python 3.9 (#122)

* Document Python 3.9 support

* Add Python 3.8 and 3.9 to default tox env list

* Add Python 3.9 to CI configuration

Author: johnthagen

.travis.yml

@@ -9,20 +9,26 @@ matrix:
       env: TOXENV=py37-django22
     - python: '3.8'
       env: TOXENV=py38-django22
+    - python: '3.9'
+      env: TOXENV=py39-django22
 
     - python: '3.6'
       env: TOXENV=py36-django30
     - python: '3.7'
       env: TOXENV=py37-django30
     - python: '3.8'
       env: TOXENV=py38-django30
+    - python: '3.9'
+      env: TOXENV=py39-django30
 
     - python: '3.6'
       env: TOXENV=py36-django31
     - python: '3.7'
       env: TOXENV=py37-django31
     - python: '3.8'
       env: TOXENV=py38-django31
+    - python: '3.9'
+      env: TOXENV=py39-django31
 
 install:
   - pip install -U pip wheel setuptools

setup.py

@@ -40,6 +40,7 @@ def read_version(fname):
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
         'Topic :: Internet :: WWW/HTTP',
     ],
 )

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{36,37}-django{22,30,31}
+    py{36,37,38,39}-django{22,30,31}
 
 [testenv]
 setenv = PYTHONPATH = {toxinidir}