[DOCS] Add PHP version require badge

README.md

@@ -10,6 +10,7 @@
 [![CGL](https://github.com/eliashaeussler/cache-warmup/actions/workflows/cgl.yaml/badge.svg)](https://github.com/eliashaeussler/cache-warmup/actions/workflows/cgl.yaml)
 [![Release](https://github.com/eliashaeussler/cache-warmup/actions/workflows/release.yaml/badge.svg)](https://github.com/eliashaeussler/cache-warmup/actions/workflows/release.yaml)
 [![Latest Stable Version](http://poser.pugx.org/eliashaeussler/cache-warmup/v)](https://packagist.org/packages/eliashaeussler/cache-warmup)
+[![PHP Version Require](http://poser.pugx.org/eliashaeussler/cache-warmup/require/php)](https://packagist.org/packages/eliashaeussler/cache-warmup)
 [![Total Downloads](http://poser.pugx.org/eliashaeussler/cache-warmup/downloads)](https://packagist.org/packages/eliashaeussler/cache-warmup)
 [![Docker](https://img.shields.io/docker/v/eliashaeussler/cache-warmup?label=docker&sort=semver)](https://hub.docker.com/r/eliashaeussler/cache-warmup)
 [![License](http://poser.pugx.org/eliashaeussler/cache-warmup/license)](LICENSE)