flows: fix linting of migrations

passbook/flows/migrations/0004_auto_20200510_2310.py

@@ -6,13 +6,22 @@ from django.db import migrations, models
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('passbook_flows', '0003_auto_20200509_1258'),
+        ("passbook_flows", "0003_auto_20200509_1258"),
     ]
 
     operations = [
         migrations.AlterField(
-            model_name='flow',
-            name='designation',
-            field=models.CharField(choices=[('authentication', 'Authentication'), ('enrollment', 'Enrollment'), ('recovery', 'Recovery'), ('password_change', 'Password Change'), ('invalidation', 'Invalidation')], max_length=100),
+            model_name="flow",
+            name="designation",
+            field=models.CharField(
+                choices=[
+                    ("authentication", "Authentication"),
+                    ("enrollment", "Enrollment"),
+                    ("recovery", "Recovery"),
+                    ("password_change", "Password Change"),
+                    ("invalidation", "Invalidation"),
+                ],
+                max_length=100,
+            ),
         ),
     ]