Update flake8 from 3.7.5 to 3.7.6 (#577)
Update flake8 from 3.7.5 to 3.7.6 (#577)


django-json-api/django-rest-framework-json-api,django-json-api/rest_framework_ember,leo-naeka/django-rest-framework-json-api,django-json-api/django-rest-framework-json-api