Use PHPStan 2.0 on CI (#18)

Fix broken link format detection (#16)

This broke in #10. The condition was wrong.

Added tests to assure this won't break again.

Support PHP 7.4 (#15)

This makes it possible to run PHPStan with this error formatter on projects that need PHP 7.

Add tests (#13)

* Add .editorconfig file

* Fix capital in namespace

* Add tests

* Enable bleeding edge for PHPStan

Check if output is decorated (#9)

* Check if output is decorated

When the output is not decorated (`--no-ansi`), we can skip highlighting the error,
as it won't have any effect anyway.

The filenames will not be clickable and therefore we don't have to trim them.

Since `Output::isDecorated` was recently introduced in PHPStan we need to bump the minimum
requirement to `1.12.4`

* Keep Composer packages sorted

Add support for relative file path in link (#6)

Add badges (#5)

Allow PHP 8.2

Add newline