Fix #258 -- Add a comment field to bank transactions

src/pretix/plugins/banktransfer/migrations/0003_banktransaction_comment.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.2 on 2016-10-08 17:50
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('banktransfer', '0002_auto_20160908_2020'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='banktransaction',
+            name='comment',
+            field=models.TextField(blank=True),
+        ),
+    ]