ver: release v2.8.1

[panjf2000]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (45a0390) 92.46% compared to head (2806c4a) 92.48%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #288      +/-   ##
==========================================
+ Coverage   92.46%   92.48%   +0.01%     
==========================================
  Files           9        9              
  Lines         770      772       +2     
==========================================
+ Hits          712      714       +2     
  Misses         44       44              
  Partials       14       14              

Flag	Coverage Δ
unittests	92.48% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pool.go	91.25% <100.00%> (+0.03%)	⬆️
pool_func.go	90.12% <100.00%> (+0.04%)	⬆️

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