fix grammar in readme

[trust-me-im-an-engineer]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.15%. Comparing base (476693b) to head (b26e37c).
⚠️ Report is 3 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #215      +/-   ##
==========================================
- Coverage   45.23%   45.15%   -0.09%     
==========================================
  Files          29       29              
  Lines        2352     2352              
==========================================
- Hits         1064     1062       -2     
- Misses       1238     1240       +2     
  Partials       50       50              

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