Fix typo in README

[tomking]

Self explanatory, fixed minor typo.

[codecov-io]

Codecov Report

Merging #32 (c99ba6c) into master (4f346cf) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #32   +/-   ##
=======================================
  Coverage   37.34%   37.34%           
=======================================
  Files           9        9           
  Lines         988      988           
  Branches       99       99           
=======================================
  Hits          369      369           
  Misses        597      597           
  Partials       22       22           

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