Avoid getting successful emails

[fidian]

This turns notifications down a bit so that only changes and failures are sent to the recipients. So, you'd get an email when

• the build starts to fail
• the build continues to fail
• the build passed the first time

[codecov-io]

Current coverage is 98.66% (diff: 100%)

Merging #67 into master will not change coverage

@@             master        #67   diff @@
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  Files            60         60          
  Lines          1725       1725          
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
  Hits           1702       1702          
  Misses           23         23          
  Partials          0          0          

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[quantumew]

Lol I thought this might get annoying. Looks good.

[kyle-long]

please