fix(readme): update prop description typo

[MariaJoaoMiraPaulo]

This PR updates a dropdownMatchSelectWidth prop description typo on README.

[vercel]

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[codecov]

Codecov Report

Merging #730 (7a3873a) into master (65c96dd) will not change coverage.
The diff coverage is n/a.

❗ Current head 7a3873a differs from pull request most recent head b24c420. Consider uploading reports for the commit b24c420 to get more accurate results

@@           Coverage Diff           @@
##           master     #730   +/-   ##
=======================================
  Coverage   99.50%   99.50%           
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  Files          25       25           
  Lines        1011     1011           
  Branches      320      320           
=======================================
  Hits         1006     1006           
  Misses          4        4           
  Partials        1        1           

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