nit: fix readme help

[kevmoo]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request primarily addresses a minor documentation formatting inconsistency in the README.md file. It ensures that the --help output example for the --headers option is correctly indented. Accompanying changes include updating the package version to 4.2.1-wip and adjusting a related test file to reflect these documentation and string processing changes.

Highlights

• Documentation Fix: Corrected the formatting of the --headers option in the README.md help output example, ensuring consistent indentation.
• Version Update: Incremented the package version to 4.2.1-wip in pubspec.yaml and added a corresponding entry in CHANGELOG.md.
• Test Adjustment: Modified command_test.dart to align with the README.md formatting change and updated the string trimming logic from trim() to trimRight().

Changelog

• CHANGELOG.md
  • Added a new version entry for 4.2.1-wip.

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[gemini-code-assist]

Code Review

This PR fixes a formatting issue in the help output shown in the README and updates the tests and version accordingly. The changes look good. I've just left one suggestion to add an entry to the changelog for this fix.