typo: 修正 README 中的错别字

[Skyenought]

描述

修正 README 中的错别字

[codecov[bot]]

Codecov Report

Merging #208 (6153418) into dev (19442a8) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #208   +/-   ##
=======================================
  Coverage   85.50%   85.50%           
=======================================
  Files          48       48           
  Lines        3692     3692           
=======================================
  Hits         3157     3157           
  Misses        423      423           
  Partials      112      112           

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