chore: remove unused variable

[wumanho]

[codecov-commenter]

Codecov Report

Merging #140 (ef0412e) into master (ce0f46c) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #140   +/-   ##
=======================================
  Coverage   65.68%   65.68%           
=======================================
  Files           6        6           
  Lines         373      373           
  Branches       89       89           
=======================================
  Hits          245      245           
  Misses        126      126           
  Partials        2        2           

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