Fix types to support booleans

[ChristianMurphy]

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Initial checklist

• [x] I read the support docs
• [x] I read the contributing guide
• [x] I agree to follow the code of conduct
• [x] I searched issues and couldn’t find anything (or linked relevant results below)
• [x] If applicable, I’ve added docs and tests

Description of changes

Follow up to https://github.com/unifiedjs/unified/pull/145#discussion_r663525201 Tests for boolean support should still pass https://github.com/unifiedjs/unified/blob/5167c49ce7e02fcd518adae0acda80ccd4e97400/types/unified-tests.ts#L80-L85

[codecov-commenter]

Codecov Report

Merging #147 (499c8a4) into main (5167c49) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #147   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          452       452           
=========================================
  Hits           452       452           

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[github-actions[bot]]

Hi! This was closed. Team: If this was merged, please describe when this is likely to be released. Otherwise, please add one of the no/* labels.

[wooorm]

nice!