zoo_data: add missing migration on removal of Log.url (fixes #18143)

zoo/zoo_data/migrations/0007_remove_log_url.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.9 on 2018-01-12 15:01
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('zoo_data', '0006_auto_20170714_0833'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='log',
+            name='url',
+        ),
+    ]