more isort

tests/test_template_tag.py

@@ -2,8 +2,8 @@ from __future__ import unicode_literals
 
 from django.template import Context, Template, TemplateSyntaxError
 from django.test import TestCase
-
 from tests.utils import create_test_video_file
+
 from wagtailvideos.models import Video
 
 

tests/utils.py

@@ -2,9 +2,8 @@ from __future__ import unicode_literals
 
 import os
 
-from django.core.files import File
-
 import tests
+from django.core.files import File
 
 
 def create_test_video_file():