Makes attachment Images a serializable class

bookwyrm/migrations/0014_auto_20201128_0118.py

@@ -0,0 +1,17 @@
+# Generated by Django 3.0.7 on 2020-11-28 01:18
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookwyrm', '0013_book_origin_id'),
+    ]
+
+    operations = [
+        migrations.RenameModel(
+            old_name='Attachment',
+            new_name='Image',
+        ),
+    ]