Add migrations for proxy models.

mayan/apps/document_comments/migrations/0004_auto_20150920_0202.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('document_comments', '0003_auto_20150729_2144'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='comment',
+            name='comment',
+            field=models.TextField(verbose_name='Comment'),
+            preserve_default=True,
+        ),
+    ]