merge package template from arlac77/npm-package-template

[arlac77]

package.json

• chore(engines): update node@>=8.9.2 from template

.travis.yml

• chore(travis): merge from template .travis.yml

[coveralls]

Coverage remained the same at 57.746% when pulling 3d79431 on template-sync-1 into 1003fee on master.

[codecov-io]

Codecov Report

Merging #14 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #14   +/-   ##
=======================================
  Coverage   60.29%   60.29%           
=======================================
  Files           2        2           
  Lines          68       68           
=======================================
  Hits           41       41           
  Misses         27       27

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