Add support for python 3.6

Author: marlontrapp

.github/workflows/python-package.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: [3.6, 3.7, 3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v2

setup.py

@@ -45,7 +45,7 @@
         'django-constance>=2,<3',
         'django-waffle>=2,<3',
     ],
-    python_requires='>=3.7',
+    python_requires='>=3.6',
     extras_require=extras_require,
     packages=find_packages(exclude=['tests']),
     include_package_data=True,

tox.ini

@@ -1,13 +1,14 @@
 [tox]
 envlist=
-    py{37,38,39}-dj22-drf310-tests
-    py{37,38,39}-dj{22,31,32}-drf{311,312}-tests
+    py{36,37,38,39}-dj22-drf310-tests
+    py{36,37,38,39}-dj{22,31,32}-drf{311,312}-tests
     py39-djmain-drf312-tests
     docs
     lint
 
 ; [gh-actions]
 ; python=
+;     3.6: py36
 ;     3.7: py37
 ;     3.8: py38, docs, lint
 ;     3.9: py39