Update README.md

[YanshiHu]

Some typos are corrected.

[Xiaojieqiu]

Thanks for the fix. Really appreciate it!

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 43.59%. Comparing base (2293afb) to head (b388fa8). Report is 4 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #704   +/-   ##
=======================================
  Coverage   43.59%   43.59%           
=======================================
  Files         161      161           
  Lines       28726    28726           
=======================================
  Hits        12522    12522           
  Misses      16204    16204           

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