Add support for device brightness

[KaidenR]

• Add the ability to get and set a device's brightness level.
• Also added service validation to soapAction function to provide better error message when tyring to use a service not supported by a device.

[KaidenR]

Oh, and I've been testing this with a Wemo Dimmer switch I got the other day and it seems to work great.

[codecov-io]

Codecov Report

Merging #61 into master will increase coverage by 0.54%. The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master      #61      +/-   ##
==========================================
+ Coverage   86.41%   86.95%   +0.54%     
==========================================
  Files           2        2              
  Lines         287      299      +12     
  Branches       47       49       +2     
==========================================
+ Hits          248      260      +12     
  Misses         39       39

Impacted Files	Coverage Δ
client.js	89.25% <92.85%> (+0.63%)	:arrow_up:

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[timonreinhard]

Thanks a lot for contributing and sorry for the late response. Cool addition!

[KaidenR]

@timonreinhard Thanks for the merge! Will you be able to do a release soon?

[timonreinhard]

Yes, will release within the next 10 days.

[KaidenR]

@timonreinhard Just a quick bump to see if we can get a new version released. We're waiting for this release to add dimming in another project (https://github.com/rudders/homebridge-platform-wemo/pull/122)

[timonreinhard]

@KaidenR Thanks for keeping me from procrastinating, it's out now ;-)