tox whitelist_externals deprecated and replaced with allowlist_externals (#1241)

Author: n2ygk

tox.ini

@@ -70,7 +70,7 @@ commands =
 [testenv:{docs,livedocs}]
 basepython = python3.8
 changedir = docs
-whitelist_externals = make
+allowlist_externals = make
 commands =
     docs: make html
     livedocs: make livehtml