Update readme

README.md

@@ -5,14 +5,13 @@
 [![Build Status][ico-actions]][link-actions]
 [![Coverage Status][ico-scrutinizer]][link-scrutinizer]
 [![Quality Score][ico-code-quality]][link-code-quality]
+[![PHPStan Level][ico-phpstan]][link-phpstan]
 [![Latest Version][ico-version]][link-packagist]
 [![Software License][ico-license]](LICENSE.md)
-[![PSR-12][ico-psr12]][link-psr12]
+[![PER][ico-per]][link-per]
 [![Total Downloads][ico-downloads]][link-downloads]
 
-Zero-dependencies PHP library to supercharge enum functionalities. Similar libraries worth mentioning are:
-- [Enum Helper](https://github.com/datomatic/enum-helper) by [Alberto Peripolli](https://github.com/trippo)
-- [Enums](https://github.com/archtechx/enums) by [Samuel Štancl](https://github.com/stancl)
+Zero-dependencies PHP library to supercharge enum functionalities.
 
 
 ## 📦 Install
@@ -404,19 +403,21 @@ The MIT License (MIT). Please see [License File](LICENSE.md) for more informatio
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-[ico-psr12]: https://img.shields.io/static/v1?label=compliance&message=PSR-12&color=blue&style=flat-square
+[ico-per]: https://img.shields.io/static/v1?label=compliance&message=PER&color=blue&style=flat-square
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 [link-author]: https://twitter.com/cerbero90
 [link-php]: https://www.php.net
 [link-packagist]: https://packagist.org/packages/cerbero/enum
 [link-actions]: https://github.com/cerbero90/enum/actions?query=workflow%3Abuild
-[link-psr12]: https://www.php-fig.org/psr/psr-12/
+[link-per]: https://www.php-fig.org/per/coding-style/
 [link-scrutinizer]: https://scrutinizer-ci.com/g/cerbero90/enum/code-structure
 [link-code-quality]: https://scrutinizer-ci.com/g/cerbero90/enum
 [link-downloads]: https://packagist.org/packages/cerbero/enum
+[link-phpstan]: https://phpstan.org/
 [link-contributors]: ../../contributors