Correctly set tox environments

.github/workflows/run-test-suite.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         python_version: [3.6, 3.7, 3.8]
-        django_version: ["django-22", "django-30"]
+        django_version: [2.2, 3.0]
 
     steps:
       - name: Checkout code

tox.ini

@@ -1,14 +1,14 @@
 [tox]
 envlist =
-    {py36,py37,py38}-django-{22,30}
+    {py3.6,py3.7,py3.8}-django{2.2,3.0}
 
 [testenv]
 setenv =
     PYTHONPATH = {toxinidir}:{toxinidir}/django_cryptolock
 commands = pytest --cov=django_cryptolock tests/
 deps =
-    django-22: django>=2.2,<3.0
-    django-30: django>=3.0,<3.1
+    django2.2: django>=2.2,<3.0
+    django3.0: django>=3.0,<3.1
     -r {toxinidir}/requirements_test.txt
 basepython =
     py38: python3.8