chore: Don't test with node 10

[nickmccurdy]

What: Don't test with node 10 (related to #922)

Why: Node 10 reached EOL on July 30th so let's free up some CI resources.

How: Remove 10 from node test matrix.

Checklist:

• [ ] Documentation added to the
  docs site
• Tests
• [ ] Typescript definitions updated
• Ready to be merged
  

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 46d9203:

Sandbox	Source
React	Configuration
react-testing-library-examples	Configuration

[codecov]

Codecov Report

Merging #927 (46d9203) into main (487eb85) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #927   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          140       140           
  Branches        28        28           
=========================================
  Hits           140       140           

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[nickmccurdy]

The test failures seem to be because of the experimental React alpha updates. No additional tests are being added here anyway, so it's safe to merge.

[eps1lon]

Closed in #930