Small improvements

[darqs]

Improvements:

• update default Electron to 7.1.8
• update jsdoc-to-markdown & nyc
• filter DevTools errors from output
• fix packager import (_this.packager is not a function #248)

[codecov-io]

Codecov Report

Merging #258 into master will increase coverage by 0.53%.
The diff coverage is 27.77%.

@@            Coverage Diff             @@
##           master     #258      +/-   ##
==========================================
+ Coverage   59.41%   59.94%   +0.53%     
==========================================
  Files          20       17       -3     
  Lines        1498     1493       -5     
==========================================
+ Hits          890      895       +5     
+ Misses        608      598      -10

Impacted Files	Coverage Δ
skeleton/app.js	5.09% <0%> (-0.24%)	⬇️
skeleton/modules/localServer.js	90.09% <100%> (+0.25%)	⬆️
skeleton/modules/dummy.js
skeleton/cordova.js
skeleton/index.js

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[KoenLav]

We were experiencing problems with Meteor Desktop and Electron 7 due to this issue: electron/electron#21018

It should be resolved in Electron 7.1.10.

[darqs]

Problem fixed in Electron 7.1.10