add test command in Readme

[sunyuan3]

Signed-off-by: Yuan Sun [email protected]

[codecov-io]

Codecov Report

Merging #60 into master will increase coverage by 0.1%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master     #60     +/-   ##
========================================
+ Coverage    6.06%   6.17%   +0.1%     
========================================
  Files          31      31             
  Lines        3691    3691             
========================================
+ Hits          224     228      +4     
+ Misses       3453    3450      -3     
+ Partials       14      13      -1

Impacted Files	Coverage Δ
pkg/pool/pool.go	75.88% <0%> (+2.35%)	⬆️

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