fix(types): missing ignore parameter for SelectorMatcherOptions

[MatanBobi]

What: Add missing ignore parameter definition in type SelectorMatcherOptions.
From the docs and the codebase it looks like it can either be a string or a boolean.

Why: Resolves #921

How: Added the missing parameter manually.

Checklist:

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

[codesandbox-ci]

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Latest deployment of this branch, based on commit 5ecc890:

Sandbox	Source
react-testing-library-examples	Configuration
cranky-gauss-gc951	Issue #921
react-testing-library demo	Issue #921

[codecov]

Codecov Report

Merging #924 (5ecc890) into master (bb83d8c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #924   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           26        26           
  Lines          948       948           
  Branches       287       287           
=========================================
  Hits           948       948           

Flag	Coverage Δ
node-10.14.2	100.00% <ø> (ø)
node-12	100.00% <ø> (ø)
node-14	100.00% <ø> (ø)
node-15	100.00% <ø> (ø)

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[timdeschryver]

LGTM

[github-actions]

🎉 This PR is included in version 7.30.3 🎉

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• GitHub release

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[allcontributors]

@nickmccurdy

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