fix(docs): typo in readme

[cexbrayat]

Fixes #42

[codecov]

Codecov Report

Merging #52 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #52   +/-   ##
=======================================
  Coverage   98.15%   98.15%           
=======================================
  Files          11       11           
  Lines         326      326           
  Branches       65       65           
=======================================
  Hits          320      320           
  Partials        6        6

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