Fix typo in README

[leafac]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and discussions and couldn’t find anything or linked relevant results below
• I made sure the docs are up to date
• I included tests (or that’s not needed)

Description of changes

I hope you don’t mind but I didn’t follow the checklist, given that I’m just fixing a typo I found when reading the documentation. Thank you very much for Unified ❤️

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d8e110e) to head (e7d1741).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #73   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           53        43   -10     
=========================================
- Hits            53        43   -10     

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[wooorm]

Thank you! :)