merge from arlac77/npm-package-template-esm-only

[arlac77]

.npmignore

• chore(npm): merge from template .npmignore

.travis.yml

• chore(travis): (jobs.include)
• chore(travis): (jobs.include.node_js)
• chore(travis): (script)

[codecov]

Codecov Report

Merging #528 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #528   +/-   ##
=======================================
  Coverage   98.66%   98.66%           
=======================================
  Files           1        1           
  Lines          75       75           
  Branches        8        8           
=======================================
  Hits           74       74           
  Misses          1        1

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