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

[arlac77]

.travis.yml

• chore(travis): add node versions -10,-11,-12
• chore(travis): add master to branches.only
• chore(travis): add /^greenkeeper/.*$/ to branches.only

[codecov]

Codecov Report

Merging #446 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #446   +/-   ##
======================================
  Coverage    98.9%   98.9%           
======================================
  Files           2       2           
  Lines         183     183           
  Branches       32      27    -5     
======================================
  Hits          181     181           
  Misses          1       1           
  Partials        1       1

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8417b91...b0110cf. Read the comment docs.

[codecov]

Codecov Report

Merging #446 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #446   +/-   ##
======================================
  Coverage    98.9%   98.9%           
======================================
  Files           2       2           
  Lines         183     183           
  Branches       32      27    -5     
======================================
  Hits          181     181           
  Misses          1       1           
  Partials        1       1

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8417b91...b0110cf. Read the comment docs.

[coveralls]

Coverage remained the same at 100.0% when pulling b0110cf on npm-template-sync-1 into 8417b91 on master.