Update connector model to add new connector

bookwyrm/migrations/0062_auto_20210406_1731.py

@@ -0,0 +1,22 @@
+# Generated by Django 3.1.6 on 2021-04-06 17:31
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookwyrm', '0061_auto_20210402_1435'),
+    ]
+
+    operations = [
+        migrations.RemoveConstraint(
+            model_name='connector',
+            name='connector_file_valid',
+        ),
+        migrations.AlterField(
+            model_name='connector',
+            name='connector_file',
+            field=models.CharField(choices=[('openlibrary', 'Openlibrary'), ('inventaire', 'Inventaire'), ('self_connector', 'Self Connector'), ('bookwyrm_connector', 'Bookwyrm Connector')], max_length=255),
+        ),
+    ]