docs: put the composer install line first in the README

[karlwaldman]

Moves the existing ## Install block (composer require oilpriceapi/oilpriceapi) from line 26 to directly under the badges, above Requirements. The Packagist version badge is already at the top (line 6), so no badge change.

Context: Packagist reports 16 total, 0 monthly downloads (curl -s https://packagist.org/packages/oilpriceapi/oilpriceapi.json, 2026-10-14).

Verification: vendor/bin/phpunit -> OK (248 tests, 766 assertions), including PublicClaimsTest which reads README.md.

Expected effect: the install command is the first thing a PHP developer sees on GitHub and Packagist (which renders this README).

🤖 Generated with Claude Code

https://claude.ai/code/session_01QQ7W3CkRKEnBpU5KRQUfUu

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 5852d4bb-50f6-46c4-ade4-42bfb6ffbec9

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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.}

[karlwaldman]

Adversarial review: APPROVE (head e85d0ef)

The README-only change moves ## Install above ## Requirements. The text is unchanged.

Tried to refute:

• Is the install line wrong? Refuted. composer.json name is oilpriceapi/oilpriceapi. https://repo.packagist.org/p2/oilpriceapi/oilpriceapi.json returns 200 with versions v3.0.1, v3.0.0, v2.1.2, so composer require oilpriceapi/oilpriceapi resolves.
• Does any test assert README section order? No; nothing in tests/ references the headings.

CI: green on PHP 8.1–8.5, PHPStan level 9 and the packaged Composer example. The live first request is skipped, as on other fork-less PRs.