fix typo in readme

[Yahkob]

What:

Why:

How:

Checklist:

• [ ] Documentation
• [ ] Tests
• [ ] Ready to be merged
• [ ] Added myself to contributors table

[codecov-io]

Codecov Report

Merging #404 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #404   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          10     10           
  Lines         177    177           
  Branches       50     50           
=====================================
  Hits          177    177

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