Add missed migration.

cvat/apps/engine/migrations/0030_auto_20200914_1331.py

@@ -0,0 +1,23 @@
+# Generated by Django 3.1.1 on 2020-09-14 13:31
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('engine', '0029_data_storage_method'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='pluginoption',
+            name='plugin',
+        ),
+        migrations.DeleteModel(
+            name='Plugin',
+        ),
+        migrations.DeleteModel(
+            name='PluginOption',
+        ),
+    ]