migrations: add missing migration for branch meta change

The branch meta change made in b91b09a0ae
apparently requires this migration - not entirely sure why, but Django's
manage.py makemigrations wants to create it.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

layerindex/migrations/0006_change_branch_meta.py

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('layerindex', '0005_layerupdate'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='branch',
+            options={'verbose_name_plural': 'Branches', 'ordering': ['sort_priority']},
+        ),
+    ]