Update composer.json description to be more descriptive

[Copilot]

The composer.json description was too generic ("Cron Linting Tool") and didn't convey the package's functionality or dual nature as both a library and CLI tool.

Changes

• Updated description from "Cron Linting Tool" to "Library and CLI tool for linting and validating cron files and expressions"
• Better reflects the package's capabilities: programmatic API (CronLinter::lintFiles(), CronLinter::lintContent()) and CLI binary (bin/lintcron)
• Improves discoverability on Packagist
• Made concise by removing redundant "PHP" mention (Composer is PHP-specific)

Original prompt

Can you review and update if needed the description value in composer.json?

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[jahidulpabelislam]

@copilot Feels a bit long.

also no need to mention PHP as composer is for PHP.

[Copilot]

@copilot Feels a bit long.

also no need to mention PHP as composer is for PHP.

Updated to be more concise: "Library and CLI tool for linting and validating cron files and expressions" (removed "PHP" and "A", shortened "cron expressions"). Commit: 5453051