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

[arlac77]

.travis.yml

• chore(travis): remove node versions 12.5.0
• chore(travis): add node versions -10,-11,-12,12.6.0

[codecov]

Codecov Report

Merging #78 into master will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##           master   #78   +/-   ##
====================================
  Coverage      88%   88%           
====================================
  Files           4     4           
  Lines         275   275           
  Branches       39    39           
====================================
  Hits          242   242           
  Misses         33    33

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