Fix isort

src/pretix/base/migrations/0098_auto_20180731_1243_squashed_0100_item_require_approval.py

@@ -1,9 +1,10 @@
 # Generated by Django 2.0.8 on 2018-09-11 14:54
 
-from django.conf import settings
 import django.core.validators
-from django.db import migrations, models
 import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
 import pretix.base.validators