Fix json serialization (#1755)
Fix json serialization (#1755)

Use the same arguments to json.dumps as JSONRenderer
https://github.com/encode/django-rest-framework/blob/ec29ff8a8013dd3383344bb78eea479d025e2a87/rest_framework/renderers.py#L100-L104

Closes #1754
comic/comic-django,comic/comic-django,comic/comic-django,comic/comic-django,comic/comic-django