Add missing migration file

stages/migrations/0008_availability_priority.py

@@ -0,0 +1,17 @@
+# Generated by Django 1.9.1 on 2016-01-19 11:35
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stages', '0007_corpcontact_archived'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='availability',
+            name='priority',
+            field=models.BooleanField(default=False, verbose_name='Prioritaire'),
+        ),
+    ]