Fix flake8 warnings.

Signed-off-by: Michael Price <loneviking72@gmail.com>

mayan/apps/rest_api/classes.py

@@ -1,6 +1,5 @@
 from __future__ import unicode_literals
 
-from django.conf.urls import include, url
 from django.conf import settings
 from django.utils.encoding import force_text, python_2_unicode_compatible
 from django.utils.module_loading import import_string