Restore encoding marks in migrations files

djstripe/migrations/0022_auto_20180117_1313.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # Generated by Django 2.0.1 on 2018-01-17 12:13
 
 from django.db import migrations, models

djstripe/migrations/0023_auto_20180523_1743.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # Generated by Django 2.0.5 on 2018-05-23 14:43
 
 from django.db import migrations

djstripe/migrations/0024_auto_20180527_0956.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # Generated by Django 2.0.5 on 2018-05-27 06:56
 
 from django.db import migrations, models

djstripe/migrations/0025_auto_20180528_0237.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # Generated by Django 2.0.5 on 2018-05-27 23:37
 
 from django.db import migrations

djstripe/migrations/0026_refund.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # Generated by Django 2.0.5 on 2018-05-28 02:37
 
 from django.db import migrations, models

djstripe/migrations/0027_auto_20170308_0620.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # Generated by Django 1.10.6 on 2017-03-08 07:18
 from __future__ import (
     absolute_import, division, print_function, unicode_literals

djstripe/migrations/0027_auto_20180528_1111.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # Generated by Django 2.0.5 on 2018-05-28 08:11
 
 from django.db import migrations

djstripe/migrations/0028_auto_20180604_0609.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # Generated by Django 2.0.5 on 2018-06-04 03:09
 
 from django.db import migrations

djstripe/migrations/0029_auto_20180604_0751.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # Generated by Django 2.0.6 on 2018-06-04 04:51
 
 from django.db import migrations