fix typo in README.md

[Xiangs18]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.02%. Comparing base (563a733) to head (d6f3ded).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #147   +/-   ##
========================================
  Coverage    81.02%   81.02%           
========================================
  Files            8        8           
  Lines         2846     2846           
========================================
  Hits          2306     2306           
  Misses         540      540           

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