fix readme example doc

[binyoucai]

fix code case

[codecov-commenter]

Codecov Report

Merging #2 (523240c) into main (2f778ee) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main        #2   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          209       209           
=========================================
  Hits           209       209           

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[kevwan]

It's generic version.

[kevwan]

readme is for generic version.