uses enum for post privacy database field

bookwyrm/migrations/0057_auto_20201026_2131.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.7 on 2020-10-26 21:31
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookwyrm', '0056_auto_20201021_0150'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='status',
+            name='privacy',
+            field=models.CharField(choices=[('public', 'Public'), ('unlisted', 'Unlisted'), ('followers', 'Followers'), ('direct', 'Direct')], default='public', max_length=255),
+        ),
+    ]