fix: export pretty format

[marcosvega91]

What: referring to this issue testing-library/react-testing-library#694 I have exported pretty-format from this library

Why: Because we can then import in @testing-library/react

How:

Checklist:

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

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[codecov]

Codecov Report

Merging #818 (27dc128) into master (2fea70c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #818   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           26        26           
  Lines          910       910           
  Branches       276       276           
=========================================
  Hits           910       910           

Impacted Files	Coverage Δ
src/pretty-dom.js	100.00% <ø> (ø)

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[kentcdodds]

I think this is a reasonable solution to the problem (to make sure everyone's using the correct version of prettyFormat and it's typings). Thank you!

[github-actions]

🎉 This PR is included in version 7.26.6 🎉

The release is available on:

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

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