docs: remove retired Go Report Card badge

[thedavidweng]

One-line cleanup carried over from the feat/hledger-backup worktree: Go Report Card is retired, so its badge no longer renders. Removes it from README.

🤖 Generated with opencode

Summary by CodeRabbit

• Documentation
  • Removed the Go Report Card badge from the README.
  • Retained the CI, release, license, and Go version badges.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: f1dbe55a-e690-4442-876e-c14a41c970b0

📥 Commits

Reviewing files that changed from the base of the PR and between 7629c7c and bffabab.

📒 Files selected for processing (1)

• README.md

💤 Files with no reviewable changes (1)

• README.md

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

---

📝 Walkthrough

Walkthrough

The README badge row removes the Go Report Card badge. Other badges remain unchanged.

Changes

Cohort / File(s)	Summary
README badge update README.md	Removes the Go Report Card badge and retains the existing CI, Release, License, and Go version badges.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to bffab

This change only removes a retired Go Report Card badge from the README and introduces no actionable merge-blocking risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the removal of the retired Go Report Card badge from the README.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/remove-goreportcard-badge

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (1 file)

• README.md

---

_{Reviewed by free · Input: 20.4K · Output: 1.3K · Cached: 78.6K}