Rebase schema migrations

netbox/extras/migrations/0028_remove_topology_maps.py

@@ -0,0 +1,16 @@
+# Generated by Django 2.2 on 2019-08-09 01:26
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('extras', '0027_webhook_additional_headers'),
+    ]
+
+    operations = [
+        migrations.DeleteModel(
+            name='TopologyMap',
+        ),
+    ]