Fixing python-modernize issues.

openedx/features/discounts/migrations/0001_initial.py

@@ -1,10 +1,11 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.20 on 2019-05-31 20:08
-from __future__ import unicode_literals
+from __future__ import absolute_import, unicode_literals
 
+import django.db.models.deletion
 from django.conf import settings
 from django.db import migrations, models
-import django.db.models.deletion
+
 import openedx.core.djangoapps.config_model_utils.models