Send security notifications when password_required_char_classes setting is changed (#4221).

git-svn-id: http://svn.redmine.org/redmine/trunk@18414 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/settings.yml

@@ -39,6 +39,7 @@ unsubscribe:
 password_required_char_classes:
   serialized: true
   default: []
+  security_notifications: 1
 password_min_length:
   format: int
   default: 8