merge package template from Kronos-Tools/npm-package-template

[arlac77]

package.json

• chore(devDependencies): update rollup@^0.51.1 from template
• chore(engines): update node@>=8.9.1 from template

.travis.yml

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

[coveralls]

Coverage decreased (-0.3%) to 77.992% when pulling 1112c0a on template-sync-1 into cacc5eb on master.

[codecov-io]

Codecov Report

Merging #215 into master will decrease coverage by 0.39%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #215     +/-   ##
=========================================
- Coverage   83.92%   83.53%   -0.4%     
=========================================
  Files           1        1             
  Lines         168      164      -4     
=========================================
- Hits          141      137      -4     
  Misses         27       27

Impacted Files	Coverage Δ
src/module.js	83.53% <0%> (-0.4%)	⬇️

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