Fix tox envs

tox.ini

@@ -10,7 +10,8 @@
 # Choose your Python versions. They have to be available
 # on the system the tests are run on.
 # comma separated
-envlist = 
+envlist =
+    python{3.6,3.7,3.8,3.9}-django2.2
     python{3.6,3.7,3.8,3.9}-django3
     python{3.8,3.9,3.10,3.11}-django4
     python{3.8,3.9,3.10,3.11}-django5
@@ -36,6 +37,12 @@ isolated_build = True
 ;changedir = tests
 
 deps =
+    django22: django>=2.2,<2.3
+    django32: django>=3.2,<3.3
+    django40: django>=4.0,<4.1
+    django41: django>=4.1,<4.2
+    django42: django>=4.2,<4.3
+    django50: django==5.0
     -rrequirements.txt
     -rrequirements_testing.txt