fix(README): Fix path of go install lazypg

[augustos0204]

The fix updates the command to point to the correct package under cmd/lazypg, where the CLI entry point is defined.

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✅ What was changed

• Fixed the go install command in the README
• Ensured compatibility with Go Modules using @latest
• Improved the installation experience for new users

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💡 Motivation

This change prevents installation errors and follows the standard Go CLI project structure, where binaries are usually located under cmd/<cli-name>.

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🧪 How to test

go install github.com/rebelice/lazypg/cmd/lazypg@latest


<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

* **Documentation**
  * Updated installation instructions to specify a more targeted module path for the installation process.

<sub>✏️ Tip: You can customize this high-level summary in your review settings.</sub>

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

[coderabbitai]

📝 Walkthrough

Walkthrough

The Go installation command in README.md has been updated to target the specific module path github.com/rebelice/lazypg/cmd/lazypg@latest instead of the root module during installation.

Changes

Cohort / File(s)	Summary
Documentation README.md	Updated Go install command to specify the target module path with @latest version

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A rabbit hops through docs with glee,
The install path now clear to see,
From root to cmd, a subtle shift,
This guidance gives a helpful lift! 🐰✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix: Fix path of go install lazypg' directly relates to the main change: updating the go install command path in README.md from the root module to the correct CLI entry point at cmd/lazypg.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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[rebelice]

Thanks for your contribution！ LGTM