That would create (potentially) unexpected behaviour, and break the separation of concern in the library design; the handler should not responsible for formatting. It would be expected that any `<handler>::handleBatch()` calls `<formatter>::formatBatch()` and implementing additional formatting in the `LogglyHandler` would cause confusion. That's my thinking, anyway.

Sorry about the duplicate pull requests. I spotted an error in the original PR and wasn't sure how long it would take to fix so I just closed it.