billing: Remove deprecated RealmAuditLog.requires_billing_update.

zerver/migrations/0205_remove_realmauditlog_requires_billing_update.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.18 on 2019-02-02 02:49
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('zerver', '0204_remove_realm_billing_fields'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='realmauditlog',
+            name='requires_billing_update',
+        ),
+    ]

zerver/models.py

@@ -2316,7 +2316,6 @@ class RealmAuditLog(models.Model):
     # If True, event_time is an overestimate of the true time. Can be used
     # by migrations when introducing a new event_type.
     backfilled = models.BooleanField(default=False)  # type: bool
-    requires_billing_update = models.BooleanField(default=False)  # type: bool
     extra_data = models.TextField(null=True)  # type: Optional[str]
 
     STRIPE_CUSTOMER_CREATED = 'stripe_customer_created'