Update README

Author: tfirdaus

README.md

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 ![Packagist PHP Version](https://img.shields.io/packagist/dependency-v/syntatis/coding-standard/php)
 
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 A collection of rulesets to apply standard PHP coding practices. The rulesets are based on some established PHP coding standards, such as [PSR-12](https://www.php-fig.org/psr/psr-12/), [Doctrine](https://github.com/doctrine/coding-standard), [Slevomat](https://github.com/slevomat/coding-standard), and are extended with a few additional rules to suit with the specific projects' needs.