Add forgotten migration

Thats a no-op migration (only validator changes).
Forgotten from 18135781db51f0fe628caa687637c1d14d2f3efd

coin/isp_database/migrations/0012_auto_20170328_2257.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import re
+import django.core.validators
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('isp_database', '0011_auto_20170309_1247'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='chatroom',
+            name='url',
+            field=models.CharField(max_length=256, verbose_name='URL', validators=[django.core.validators.RegexValidator(regex=re.compile('(?P<protocol>\\w+://)(?P<server>[\\w\\.]+)/(?P<channel>.*)'), message='Enter a value of the form  <proto>://<server>/<channel>')]),
+        ),
+    ]