Run 2to3 -f future . -w

This will remove imports from __future__ that are no longer needed.

https://docs.python.org/3.5/library/2to3.html#2to3fixer-future

openedx/tests/completion_integration/test_models.py

@@ -2,7 +2,7 @@
 Test models, managers, and validators.
 """
 
-from __future__ import absolute_import, division, unicode_literals
+
 
 import six
 from completion import models, waffle