Apply suggestions from code review

Author: Pierre-Sassoulas

tox.ini

@@ -7,8 +7,8 @@ envlist =
     flake8
     pylint
     readme
-    py{39}-django{22,30,31,32}
-    py{39,310,311,312}-django{40,41,42}
+    py{38,39}-django{22,30,31,32}
+    py{38,39,310,311,312}-django{40,41,42}
     py{310,311,312,313}-django{50,51,-main}
 
 requires =
@@ -21,7 +21,7 @@ commands =
     django_not_installed: bash pylint_django/tests/test_django_not_installed.sh
     pylint: pylint pylint_django
     readme: bash -c "poetry build && twine check dist/*"
-    py{39,310,311,312,313}-django{22,30,31,32,40,41,42,50}: bash scripts/test.sh --cov=pylint_django
+    py{38,39,310,311,312,313}-django{22,30,31,32,40,41,42,50}: bash scripts/test.sh --cov=pylint_django
     clean: find . -type f -name '*.pyc' -delete
     clean: find . -type d -name __pycache__ -delete
     clean: rm -rf build/ .cache/ dist/ .eggs/ pylint_django.egg-info/ .tox/