Update isort from 4.3.15 to 4.3.16 (#602)
Update isort from 4.3.15 to 4.3.16 (#602)


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