Added missing migration

features/content/migrations/0013_auto_20180308_0929.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.11 on 2018-03-08 08:29
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('content2', '0012_auto_20180222_1116'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='content',
+            name='poll',
+            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='content', to='polls.WorkaroundPoll'),
+        ),
+    ]