[Announce] node-red-node-ui-microphone

[knolleary]

Have you enabled MediaRecorder in Safari?

@knolleary

It uses the MediaRecorder API that is widely supported, however:

• no support in IE at all - don't ask
• it needs to be enabled in Safari ( Develop -> Experimental Features -> MediaRecorder )

Not sure why you get that error in Chrome/FF on Mac as that's exactly what I developed and tested it against.

I will add some feature detection and disable the button if MediaRecorder isn't available. And add those notes about safari to the readme.