docs(readme): mention git-changelog-command-line tool

[tomasbjerre]

Description

Updating README with reference to my command line tool.

Motivation and Context

How Has This Been Tested?

Screenshots / Logs (if applicable)

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[welcome]

Thanks for opening this pull request! Please check out our contributing guidelines! ⛰️

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.27%. Comparing base (69abe95) to head (d018207).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #589   +/-   ##
=======================================
  Coverage   41.27%   41.27%           
=======================================
  Files          15       15           
  Lines        1071     1071           
=======================================
  Hits          442      442           
  Misses        629      629           

Flag	Coverage Δ
unit-tests	41.27% <ø> (ø)

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[welcome]

Congrats on merging your first pull request! ⛰️