Drop support for Django 3.0.

Author: hramezani

setup.cfg

@@ -14,7 +14,6 @@ classifiers =
     Environment :: Web Environment
     Framework :: Django
     Framework :: Django :: 2.2
-    Framework :: Django :: 3.0
     Framework :: Django :: 3.1
     Intended Audience :: Developers
     License :: OSI Approved :: BSD License

tox.ini

@@ -3,14 +3,13 @@ envlist =
     docs
     style
     readme
-    py{36,37}-dj{22,30,31,32}-sqlite
-    py{38,39}-dj{22,30,31,32,main}-sqlite
-    py{36,37,38,39}-dj{22,30,31,32}-{postgresql,mysql}
+    py{36,37}-dj{22,31,32}-sqlite
+    py{38,39}-dj{22,31,32,main}-sqlite
+    py{36,37,38,39}-dj{22,31,32}-{postgresql,mysql}
 
 [testenv]
 deps =
     dj22: Django==2.2.*
-    dj30: Django==3.0.*
     dj31: Django==3.1.*
     dj32: Django>=3.2a1,<4.0
     sqlite: mock
@@ -43,19 +42,19 @@ whitelist_externals = make
 pip_pre = True
 commands = make coverage TEST_ARGS='{posargs:tests}'
 
-[testenv:py{36,37,38,39}-dj{22,30,31,32}-postgresql]
+[testenv:py{36,37,38,39}-dj{22,31,32}-postgresql]
 setenv =
     {[testenv]setenv}
     DB_BACKEND = postgresql
     DB_PORT = {env:DB_PORT:5432}
 
-[testenv:py{36,37,38,39}-dj{22,30,31,32}-mysql]
+[testenv:py{36,37,38,39}-dj{22,31,32}-mysql]
 setenv =
     {[testenv]setenv}
     DB_BACKEND = mysql
     DB_PORT = {env:DB_PORT:3306}
 
-[testenv:py{36,37,38,39}-dj{22,30,31,32,main}-sqlite]
+[testenv:py{36,37,38,39}-dj{22,31,32,main}-sqlite]
 setenv =
     {[testenv]setenv}
     DB_BACKEND = sqlite3