Add Django 4 to test matrix, drop not supported versions

https://endoflife.date/django

Author: amureki

.github/workflows/django.yml

@@ -13,8 +13,8 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.7, 3.8, 3.9]
-        Django-version: [<3.0, <3.2, <4.0]
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
+        Django-version: [<3.2, <4.0, <4.1]
 
     steps:
     - uses: actions/checkout@v2

setup.py

@@ -48,7 +48,7 @@ def readfile(filename):
     platforms=['OS Independent'],
     classifiers=CLASSIFIERS,
     install_requires=[
-        'Django>=1.8,<3.3',
+        'Django>=3.2,<4.1',
     ],
     packages=find_packages(exclude=['example', 'docs']),
     include_package_data=True,