Update README.md

[ymh199478]

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[codecov-io]

Codecov Report

Merging #1 into master will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master       #1      +/-   ##
==========================================
- Coverage      95%   94.86%   -0.14%     
==========================================
  Files          29       29              
  Lines        2921     2921              
==========================================
- Hits         2775     2771       -4     
- Misses        116      120       +4     
  Partials       30       30

Impacted Files	Coverage Δ
src/CatLib.Core/Support/Util/Str.cs	90.85% <0%> (-1.22%)	⬇️
src/CatLib.Core/Support/Util/Arr.cs	98.54% <0%> (-0.98%)	⬇️

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