[fix] Migrate credit note feature

coin/billing/migrations/0017_auto_20180416_0103.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('billing', '0016_auto_20180415_2208'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='payment',
+            name='payment_mean',
+            field=models.CharField(default='transfer', max_length=100, null=True, verbose_name='moyen de paiement', choices=[('cash', 'Esp\xe8ces'), ('check', 'Ch\xe8que'), ('transfer', 'Virement'), ('creditnote', 'Avoir'), ('other', 'Autre')]),
+        ),
+    ]