Fix missing migration

submissions/migrations/0030_auto_20170313_1646.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.3 on 2017-03-13 15:46
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('submissions', '0029_auto_20170131_1425'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='report',
+            name='submission',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='reports', to='submissions.Submission'),
+        ),
+    ]