Upgrade deps, formatting, node 8 in Travis

[boopathi]

No description provided.

[codecov]

Codecov Report

Merging #573 into master will increase coverage by 0.03%.
The diff coverage is 94.73%.

@@            Coverage Diff             @@
##           master     #573      +/-   ##
==========================================
+ Coverage   82.93%   82.96%   +0.03%     
==========================================
  Files          41       41              
  Lines        2743     2748       +5     
  Branches      958      958              
==========================================
+ Hits         2275     2280       +5     
  Misses        282      282              
  Partials      186      186

Impacted Files	Coverage Δ
...e-consecutive-adds/src/array-property-collapser.js	82.97% <100%> (+0.37%)	⬆️
...sform-inline-consecutive-adds/src/set-collapser.js	84.21% <100%> (+0.42%)	⬆️
packages/babel-plugin-minify-simplify/src/index.js	80.74% <100%> (ø)	⬆️
...rm-inline-consecutive-adds/src/object-collapser.js	93.33% <100%> (+0.22%)	⬆️
...gin-transform-inline-consecutive-adds/src/index.js	80% <100%> (+0.2%)	⬆️
...l-plugin-minify-dead-code-elimination/src/index.js	85.5% <100%> (ø)	⬆️
...orm-inline-consecutive-adds/src/array-collapser.js	78.57% <100%> (+0.79%)	⬆️
...bel-plugin-minify-guarded-expressions/src/index.js	69.04% <50%> (ø)	⬆️

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[hzoo]

can remove 7