Merge branch 'master' into fix-copyright-boilerplate

Author: ahsan-z-khan

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = black-format,flake8,pylint,docstyle,sphinx,doc8,twine,py36,py37
+envlist = black-format,flake8,pylint,docstyle,sphinx,doc8,twine,py36,py37,py38
 
 skip_missing_interpreters = False
 
@@ -71,7 +71,7 @@ commands =
     {env:IGNORE_COVERAGE:} coverage report -i --fail-under=86
 deps = .[test]
 depends =
-    {py36,py37}: clean
+    {py36,py37,py38}: clean
 
 [testenv:flake8]
 skipdist = true