chore(options): update default capacity as zero

[appleboy]

Signed-off-by: Bo-Yi.Wu [email protected]

[codecov-commenter]

Codecov Report

Merging #100 (dda7b8a) into master (c65a57a) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #100   +/-   ##
=======================================
  Coverage   89.42%   89.42%           
=======================================
  Files           7        7           
  Lines         397      397           
=======================================
  Hits          355      355           
  Misses         33       33           
  Partials        9        9           

Flag	Coverage Δ
go-1.17	89.42% <100.00%> (ø)
go-1.18	89.42% <100.00%> (ø)
go-1.19	89.42% <100.00%> (ø)
ubuntu-latest	89.42% <100.00%> (ø)

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Impacted Files	Coverage Δ
consumer.go	91.54% <100.00%> (ø)
options.go	88.88% <100.00%> (ø)

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