Correct typo

[vivekjoshy]

Fix pointed out by vulume on discord.

Description of Changes

• Wrote at least one-line docstrings (for any new functions)
• Added test(s) covering the changes (if testable)

Affirmation

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I affirm the Developer Certificate of Origin
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and understand I am releasing the same under openskill.py's MIT license.

I certify the above statement is true and correct: @vivekjoshy

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (8be3474) to head (bfa3b58).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #150   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines         1926      1926           
  Branches       470       470           
=========================================
  Hits          1926      1926           

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