chore: コマンドライン引数の設定方法を変更

[jiro4989]

No description provided.

[codecov]

Codecov Report

Merging #14 (b0e3d8c) into master (0939ae7) will increase coverage by 4.08%.
The diff coverage is 41.66%.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
+ Coverage   48.85%   52.94%   +4.08%     
==========================================
  Files          11       11              
  Lines         350      323      -27     
==========================================
  Hits          171      171              
+ Misses        174      147      -27     
  Partials        5        5              

Impacted Files	Coverage Δ
cmd_center.go	21.42% <41.66%> (+5.21%)	⬆️
cmd_left.go	21.42% <41.66%> (+5.21%)	⬆️
cmd_right.go	21.42% <41.66%> (+5.21%)	⬆️

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