MicEnabled bug fix and Invisible

[hklages]

MicEnabled bug fix and added Invisible property

Description

1. MicEnabled ==='1' // instead of 1

2. Added Invisible to same part

3. Invisible === '1' // instead of 1

4. was already done in beta - these changes replace the beta stuff.

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• [ x ] Make sure you are requesting to pull a topic/feature/bugfix branch (right side). Don't request your master!
• [ x ] Make sure you are making a pull request against the beta branch (left side). Also you should start your branch off svrooij/node-sonos-ts/beta.
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• [ ] Check you add tests for added code.

[svrooij]

This error is fixed in #129, which will be released to beta any minute.