Update Django 4.0 stable versions

Author: pauloxnet

setup.cfg

@@ -17,6 +17,7 @@ classifiers =
     Framework :: Django :: 2.2
     Framework :: Django :: 3.1
     Framework :: Django :: 3.2
+    Framework :: Django :: 4.0
     Intended Audience :: Developers
     License :: OSI Approved :: BSD License
     Operating System :: OS Independent

tox.ini

@@ -8,10 +8,10 @@ envlist =
 
 [testenv]
 deps =
-    dj22: Django==2.2.*
-    dj31: Django==3.1.*
-    dj32: Django>=3.2,<4.0
-    dj40: Django>=4.0rc1,<4.1
+    dj22: django~=2.2.17
+    dj31: django~=3.1.3
+    dj32: django~=3.2.9
+    dj40: django~=4.0.0
     sqlite: mock
     postgresql: psycopg2-binary
     postgis: psycopg2-binary
@@ -43,19 +43,19 @@ whitelist_externals = make
 pip_pre = True
 commands = make coverage TEST_ARGS='{posargs:tests}'
 
-[testenv:py{36,37,38,39,310}-dj{22,31,32}-postgresql]
+[testenv:py{36,37,38,39,310}-dj{22,31,32,40,main}}-postgresql]
 setenv =
     {[testenv]setenv}
     DB_BACKEND = postgresql
     DB_PORT = {env:DB_PORT:5432}
 
-[testenv:py{36,37,38,39,310}-dj{22,31,32}-mysql]
+[testenv:py{36,37,38,39,310}-dj{22,31,32,40,main}}-mysql]
 setenv =
     {[testenv]setenv}
     DB_BACKEND = mysql
     DB_PORT = {env:DB_PORT:3306}
 
-[testenv:py{36,37,38,39,310}-dj{22,31,32,main}-sqlite]
+[testenv:py{36,37,38,39,310}-dj{22,31,32,40,main}-sqlite]
 setenv =
     {[testenv]setenv}
     DB_BACKEND = sqlite3