feat: support binary file diff (fixes #17)

[yeonjuan]

fixes #17

[codecov-commenter]

Codecov Report

Merging #18 (e9e4b4f) into main (468b932) will increase coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   98.10%   98.33%   +0.23%     
==========================================
  Files           4        4              
  Lines         158      180      +22     
  Branches       36       50      +14     
==========================================
+ Hits          155      177      +22     
  Misses          2        2              
  Partials        1        1              

Flag	Coverage Δ
unittest	98.33% <100.00%> (+0.23%)	⬆️

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Files Changed	Coverage Δ
src/parse-git-diff.ts	98.12% <100.00%> (+0.29%)	⬆️