Remove contenttypes.generic import fallbacks

sample_project/app/models.py

@@ -1,10 +1,4 @@
-from django import VERSION
-
-if VERSION < (1, 9):
-    from django.contrib.contenttypes.generic import GenericForeignKey
-else:
-    from django.contrib.contenttypes.fields import GenericForeignKey
-
+from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
 from django.db import models
 from django.utils.encoding import python_2_unicode_compatible