fix object is converted to array

[kazupon]

closes #84

[codecov-io]

Codecov Report

Merging #85 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #85   +/-   ##
=======================================
  Coverage   88.67%   88.67%           
=======================================
  Files          16       16           
  Lines         768      768           
  Branches      110      110           
=======================================
  Hits          681      681           
  Misses         42       42           
  Partials       45       45

Impacted Files	Coverage Δ
src/commands/list.ts	78.08% <100%> (ø)	⬆️

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