More readable names in the Tox matrix definition

tox.ini

@@ -1,27 +1,27 @@
 [tox]
 envlist =
-    py35-{22}
-    py36-{30,31,32}
-    py38-{30,31,32,40}
-    py310-{30,31,32,40}
+    py3.5-{dj2.2}
+    py3.6-{dj3.0,dj3.1,dj3.2}
+    py3.8-{dj3.0,dj3.1,dj3.2,dj4.0}
+    py3.10-{dj3.0,dj3.1,dj3.2,dj4.0}
 
 [gh-actions]
 python =
-    3.5: py35
-    3.6: py36
-    3.8: py38
-    3.10: py310
+    3.5: py3.5
+    3.6: py3.6
+    3.8: py3.8
+    3.10: py3.10
 
 [testenv]
 usedevelop = true
 deps =
     selenium
     coverage
-    22: Django >= 2.2, < 3.0
-    30: Django >= 3.0, < 3.1
-    31: Django >= 3.1, < 3.2
-    32: Django >= 3.2, < 4.0
-    40: Django >= 4.0, < 4.1
+    dj2.2: Django >= 2.2, < 3.0
+    dj3.0: Django >= 3.0, < 3.1
+    dj3.1: Django >= 3.1, < 3.2
+    dj3.2: Django >= 3.2, < 4.0
+    dj4.0: Django >= 4.0, < 4.1
 commands =
     python example/manage.py collectstatic --noinput -v 0
     coverage run -p example/manage.py test example -v 3