fix flake8 errors in docs/conf.py
fix flake8 errors in docs/conf.py

linuxmaniac/django-extensions,django-extensions/django-extensions,haakenlid/django-extensions,jpadilla/django-extensions,linuxmaniac/django-extensions,django-extensions/django-extensions,jpadilla/django-extensions,kevgathuku/django-extensions,kevgathuku/django-extensions,jpadilla/django-extensions,haakenlid/django-extensions,haakenlid/django-extensions,django-extensions/django-extensions,linuxmaniac/django-extensions,kevgathuku/django-extensions