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 25.714% when pulling c18e907 on template-sync-1 into bb8593b on master.

[codecov-io]

Codecov Report

Merging #16 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #16   +/-   ##
=======================================
  Coverage   28.12%   28.12%           
=======================================
  Files           2        2           
  Lines          32       32           
=======================================
  Hits            9        9           
  Misses         23       23

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