feat: config.subDir

[aa900031]

Resolve #85

A new subDir config defaulting to / and when is set, filters commits only relevant to this subpath and also operates package.json and CHANGELOG.md in {rootDir}/{subDir} for updating

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 74.84%. Comparing base (ec858d1) to head (4b15528).
⚠️ Report is 116 commits behind head on main.

Files with missing lines	Patch %	Lines
src/semver.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
+ Coverage   71.55%   74.84%   +3.29%     
==========================================
  Files           7        7              
  Lines         798      811      +13     
  Branches       90       96       +6     
==========================================
+ Hits          571      607      +36     
+ Misses        227      204      -23     

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[kleinpetr]

What about this PR? It's must have to be able to generate changelog per package or folder.