README.md: fix a typo

[kulong0105]

fix a typo

[codecov]

Codecov Report

Merging #2913 (d38d86d) into master (464535f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2913   +/-   ##
=======================================
  Coverage   98.72%   98.72%           
=======================================
  Files          41       41           
  Lines        3066     3066           
=======================================
  Hits         3027     3027           
  Misses         27       27           
  Partials       12       12           

Flag	Coverage Δ
go-1.13	98.72% <ø> (ø)
go-1.14	98.56% <ø> (ø)
go-1.15	98.56% <ø> (ø)
go-1.16	98.56% <ø> (ø)
go-1.17	98.46% <ø> (ø)
macos-latest	98.72% <ø> (+0.17%)	⬆️
nomsgpack	98.70% <ø> (ø)
ubuntu-latest	98.72% <ø> (ø)

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