Add missing migration file from previous merge

coin/billing/migrations/0007_auto_20170801_1530.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', '0006_auto_20170608_2305'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='invoice',
+            name='date_due',
+            field=models.DateField(help_text='Le d\xe9lai de paiement sera fix\xe9 \xe0 30 jours \xe0 la validation si laiss\xe9 vide', null=True, verbose_name="date d'\xe9ch\xe9ance de paiement", blank=True),
+        ),
+    ]