docs: fix readme

[hanxiao]

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@e8aa643). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #656   +/-   ##
=======================================
  Coverage        ?   84.00%           
=======================================
  Files           ?        2           
  Lines           ?      100           
  Branches        ?        0           
=======================================
  Hits            ?       84           
  Misses          ?       16           
  Partials        ?        0           

Flag	Coverage Δ
cas	84.00% <0.00%> (?)

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