MusicCast integration reports on available firmware updates for devices

Because I so rarely go into the Yamaha MusicCast app, I just discovered that both of my devices had firmware updates available.

With HA now specifically supporting the Update entity, it would be great if the MusicCast integration could report on available firmware updates.

This would be great as I only found out there was an update when my AMP went offline and I bumped a button on the TV remote.