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

[arlac77]

package.json

• chore(scripts): cover@#overwrite c8 -x 'tests/**/*' --temp-directory build/tmp ava && c8 report -r lcov -o build/coverage --temp-directory build/tmp
• chore(engines): node@>=12.14.0

.travis.yml

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

[codecov]

Codecov Report

Merging #137 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #137   +/-   ##
=====================================
  Coverage      88%    88%           
=====================================
  Files           4      4           
  Lines         275    275           
  Branches       33     33           
=====================================
  Hits          242    242           
  Misses         33     33

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