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

[arlac77]

package.json

• chore(package): c8@^4.1.3
• chore(scripts): cover@#overwrite c8 --temp-directory build/coverage ava && c8 report -r lcov --temp-directory build/coverage
• chore(scripts): posttest@markdown-doctest

[codecov]

Codecov Report

Merging #80 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #80   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines          88     88           
  Branches       16     16           
=====================================
  Hits           88     88

---

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[coveralls]

Pull Request Test Coverage Report for Build 230

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

---

Totals
Change from base Build 229:	0.0%
Covered Lines:	88
Relevant Lines:	88

---

💛 - Coveralls

[arlac77]

🎉 This PR is included in version 1.1.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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