Run lint with Python 3.8

Author: leplatrem

tox.ini

@@ -2,7 +2,7 @@
 usedevelop = True
 minversion = 1.8
 envlist =
-    py36-lint,
+    py38-lint,
     py36-dj{111,21,22}-docs,
     # the version matrix according to the Django docs:
     # https://docs.djangoproject.com/en/2.0/faq/install/#what-python-version-can-i-use-with-django
@@ -37,8 +37,8 @@ commands =
     tests: pytest {posargs:tests}
     docs: sphinx-build -b html -d {envtmpdir}/doctrees docs {envtmpdir}/html
 
-[testenv:py36-lint]
-basepython = python3.6
+[testenv:py38-lint]
+basepython = python3.8
 deps =
     flake8
     flake8-black