update doc

Author: cesargb

README.md

@@ -6,6 +6,7 @@ PHP Class to rotate log files
 This class permit log rotating with diferetne processor.
 
 [![tests](https://github.com/cesargb/php-log-rotation/workflows/tests/badge.svg)](https://github.com/cesargb/php-log-rotation/actions)
+[![phpstan](https://github.com/cesargb/php-log-rotation/actions/workflows/phpstan.yml/badge.svg)](https://github.com/cesargb/php-log-rotation/actions/workflows/phpstan.yml)
 [![Latest Version on Packagist](https://img.shields.io/packagist/v/cesargb/php-log-rotation.svg?style=flat-square&color=brightgreen)](https://packagist.org/packages/cesargb/php-log-rotation)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/cesargb/php-log-rotation/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/cesargb/php-log-rotation/?branch=master)