docs: added the PHPStan badge (#108)

README.md

@@ -2,6 +2,7 @@
 
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 [![PHP Version Require](https://poser.pugx.org/strangebuzz/microsymfony/require/php?style=flat-square)](https://packagist.org/packages/strangebuzz/microsymfony)
+[![level](https://img.shields.io/badge/level-max-success?style=flat-square&logo=data:image/png;base64,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)](https://github.com/strangebuzz/MicroSymfony/actions)
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 [![Code Coverage](https://scrutinizer-ci.com/g/strangebuzz/MicroSymfony/badges/coverage.png?b=main)](https://scrutinizer-ci.com/g/strangebuzz/MicroSymfony/code-structure/main/code-coverage/src/)