feat: add switch role to toBeChecked

[jonrimmer]

What:

Add support for the ARIA switch role to the toBeChecked matcher.

Why:

The switch role works the same as the checkbox role, with the switch's status exposed via aria-checked, but toBeChecked() cannot be used with a switch because only the checkbox and radio roles are currently implemented.

How:

Added 'switch' to the list of allowed roles in to-be-checked.js

Checklist:

• Documentation
• Tests
• Updated Type Definitions — N/A (No type definitions in this project.)
• Ready to be merged
  

[codecov]

Codecov Report

Merging #228 into master will not change coverage by %.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #228   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           19        19           
  Lines          257       257           
  Branches        62        62           
=========================================
  Hits           257       257           

Impacted Files	Coverage Δ
src/to-be-checked.js	100.00% <100.00%> (ø)

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[gnapse]

Thanks!

[gnapse]

@all-contributors add @jonrimmer for code, test

[allcontributors]

@gnapse

I've put up a pull request to add @jonrimmer! 🎉

[gnapse]

🎉 This PR is included in version 5.4.0 🎉

The release is available on:

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

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