Refactor setup.py

Author: mdmintz

setup.py

@@ -268,7 +268,7 @@
             'flake8==3.7.9;python_version<"3.5"',
             'flake8==3.9.2;python_version>="3.5" and python_version<"3.6"',
             'flake8==4.0.1;python_version>="3.6"',
-            'mccabe==0.6.1',
+            "mccabe==0.6.1",
             'pyflakes==2.1.1;python_version<"3.5"',
             'pyflakes==2.3.1;python_version>="3.5" and python_version<"3.6"',
             'pyflakes==2.4.0;python_version>="3.6"',