reorganize imports with ruff

forum/migrations/0001_initial.py

@@ -1,12 +1,13 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
+import datetime
+
+import django.db.models.deletion
+import django.utils.timezone
+from django.conf import settings
 from django.db import migrations, models
 from django.utils.timezone import utc
-from django.conf import settings
-import django.utils.timezone
-import datetime
-import django.db.models.deletion
 
 
 class Migration(migrations.Migration):

forum/migrations/0004_auto_20170531_1949.py

@@ -1,8 +1,8 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import migrations, models
 import django.db.models.deletion
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):

forum/migrations/0005_forumtopic_subscribed_users.py

@@ -1,8 +1,8 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import migrations, models
 from django.conf import settings
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):

forum/migrations/0006_auto_20180426_2013.py

@@ -2,6 +2,7 @@
 from __future__ import unicode_literals
 
 from django.db import migrations, models
+
 import forum.models