insert_all! missing from list of blocked bulk operations for audit logging

[medlefsen]

Ran into a case where we were calling insert_all! on a model without disabling audit logging. Looks like we don't have this method on the list. We do have insert_all without the ! and the only difference between them how they handle conflicts, so I think we would want both.

https://github.com/Betterment/journaled/blob/master/lib/journaled/audit_log.rb#L181-L188