Add autoflake to linting-ci

Author: cgoldberg

py/tox.ini

@@ -46,6 +46,8 @@ commands =
   isort --check-only --diff selenium/ test/ conftest.py
   ; execute black in check only mode with diff
   black --check --diff selenium/ test/ conftest.py -l 120
+  ; execute autoflake in check only mode with diff
+  autoflake --check-diff selenium/ test/ conftest.py
   ; execute flake8
   flake8 selenium/ test/ --min-python-version=3.9
   ; execute docformatter in check only mode with diff