add missing trivial migration

src/c3nav/control/migrations/0003_auto_20171210_1452.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.6 on 2017-12-10 14:52
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('control', '0002_userpermissions_access_all'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='userpermissions',
+            name='access_all',
+            field=models.BooleanField(default=False, verbose_name='can grant access to everything'),
+        ),
+    ]