Update tox.ini

Co-authored-by: Ian Stapleton Cordasco <graffatcolmingov@gmail.com>

tox.ini

@@ -10,7 +10,7 @@ setenv =
 deps =
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-       .[yaml,toml,baseline]
+extras = yaml toml baseline
 commands =
     find bandit -type f -name "*.pyc" -delete
     stestr run {posargs}