no longer log firmwareUpdateStatusChanged event on warn level
no longer log firmwareUpdateStatusChanged event on warn level

- to not confuse user
- logging an info
- closes #226

ioBroker/ioBroker.hm-rpc,ioBroker/ioBroker.hm-rpc,ioBroker/ioBroker.hm-rpc,ioBroker/ioBroker.hm-rpc