switch to GitHub Actions

[msimerson]

• chore(ci): switch reporter from nyc to c8
• chore(nyc): remove dependency
• move .eslintrc to .eslintrc.yaml (be explicit)
• incorporates and closes Switch to GitHub Actions #76

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[msimerson]

Notes

• you can see a workflow run here.
• you could move the eslint dependencies out of package.json and into the lint step
  • pro: faster CI steps
  • con: to get 'npm run lint' on the CLI, you'd need to use npx to install it
• the needs: $step are optional, you can remove them instead of chaining
• coverage is reported to both coveralls and codecov. Nuke one or the other, or not. 🤷‍♂️

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@dbfe59b). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #83   +/-   ##
=========================================
  Coverage          ?   98.00%           
=========================================
  Files             ?        6           
  Lines             ?     1854           
  Branches          ?        0           
=========================================
  Hits              ?     1817           
  Misses            ?       37           
  Partials          ?        0           

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