How to hide "deprecated" message?

[Maximilian Noppel]

Hey,

is there a way log all message from server to a log file? I set
logs: { out: 'file.log', err: 'file.log' }
but i get some "deprecated" messsages into my grunt output. Because it is async, i cannot read my grunt output very clearly. Is there a way to hide them?

Thanks,
Max