doc: fix typo in README

[hadrien]

Problem

• Typo in the README

Solution

• Fix it

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2ae70e4) to head (028d1b0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #12   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           93        93           
  Branches         6         6           
=========================================
  Hits            93        93           

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