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

[arlac77]

package.json

• chore(package): ava@^2.1.0
• chore(scripts): cover@#overwrite c8 --temp-directory build/tmp ava && c8 report -r lcov -o build/coverage --temp-directory build/tmp

[codecov]

Codecov Report

Merging #70 into master will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##           master   #70   +/-   ##
====================================
  Coverage      88%   88%           
====================================
  Files           4     4           
  Lines         275   275           
  Branches       40    40           
====================================
  Hits          242   242           
  Misses         33    33

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