python formatting

bookwyrm/migrations/0064_auto_20210408_2208.py

@@ -0,0 +1,28 @@
+# Generated by Django 3.1.6 on 2021-04-08 22:08
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("bookwyrm", "0063_auto_20210408_1556"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="listitem",
+            name="book_list",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE, to="bookwyrm.list"
+            ),
+        ),
+        migrations.AlterField(
+            model_name="shelfbook",
+            name="shelf",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.PROTECT, to="bookwyrm.shelf"
+            ),
+        ),
+    ]