fix: update execa dependency to 2.1.0

[Trott]

This PR contains:

• bugfix
• feature
• refactor
• tests
• documentation
• metadata

Breaking Changes?

• yes
• no

If yes, please describe the breakage.

Please Describe Your Changes

Update execa dependency to 2.1.0 in package-lock.json. Without this
change, tests will fail when run with Node.js 13.x-pre and may fail when
13.0.0 is released in 13 days.

Refs: sindresorhus/execa#370

[codecov-io]

Codecov Report

Merging #147 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #147   +/-   ##
=======================================
  Coverage   97.24%   97.24%           
=======================================
  Files           1        1           
  Lines         145      145           
=======================================
  Hits          141      141           
  Misses          4        4

---

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[shellscape]

Thanks for this PR 🍺

[Trott]

I know it's just a test fix, but any chance I can persuade you to publish a new release? There seem to be some legitimate bug fixes since the last release, so it wouldn't be a complete no-change release for end users. This particular fix will help Node.js's ecosystem-testing tool CITGM, which downloads a tarball of the latest release and runs tests. So CITGM won't use this fix until it's part of a release.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.24%. Comparing base (d221504) to head (15f0d7b).
⚠️ Report is 15 commits behind head on master.
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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #147   +/-   ##
=======================================
  Coverage   97.24%   97.24%           
=======================================
  Files           1        1           
  Lines         145      145           
=======================================
  Hits          141      141           
  Misses          4        4           

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