fix reverse diff

[kazupon]

No description provided.

[codecov-io]

Codecov Report

Merging #71 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master     #71   +/-   ##
======================================
  Coverage    90.2%   90.2%           
======================================
  Files          11      11           
  Lines         582     582           
  Branches       81      81           
======================================
  Hits          525     525           
  Misses         24      24           
  Partials       33      33

Impacted Files	Coverage Δ
src/commands/diff.ts	82.85% <100%> (ø)	⬆️

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