Credit readline keybinding contributor in changelog

[Ameyanagi]

Summary

• add an Unreleased changelog section for the next release
• document the readline-style TUI keybindings and Unicode-aware cursor behavior from feat: Add keybinds like readline #3
• credit @gw31415 with a direct GitHub profile link

[greptile-apps]

Greptile Summary

Adds an Unreleased changelog entry documenting readline-style TUI keybindings and Unicode-aware cursor positioning while crediting the contributor.

Confidence Score: 5/5

The documentation-only change appears safe to merge.

The new changelog entry is clear, correctly placed, and introduces no runtime, build, security, or compatibility changes.

Important Files Changed

Filename	Overview
CHANGELOG.md	Adds an accurate, well-formatted Unreleased entry with links to the originating pull request and contributor profile.

_{Reviews (1): Last reviewed commit: "docs: Credit readline keybinding contrib..." | Re-trigger Greptile}

[Copilot]

Pull request overview

Adds an Unreleased section to the changelog to document recently added readline-style TUI editing key bindings and Unicode-aware cursor behavior, and credits the original contributor from PR #3.

Changes:

• Added a new ## Unreleased section at the top of CHANGELOG.md.
• Documented the readline-style TUI key bindings + Unicode-aware cursor positioning.
• Credited @gw31415 with a direct GitHub profile link and linked the originating PR.

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