chore: update readme php version limit

Author: inhere

README.md

@@ -1,11 +1,11 @@
 # FileSystem Util
 
 [![License](https://img.shields.io/packagist/l/toolkit/fsutil.svg?style=flat-square)](LICENSE)
-[![Php Version](https://img.shields.io/badge/php-%3E=8.0-brightgreen.svg?maxAge=2592000)](https://packagist.org/packages/toolkit/fsutil)
+[![Php Version Support](https://img.shields.io/packagist/php-v/toolkit/fsutil)](https://packagist.org/packages/toolkit/fsutil)
 [![Latest Stable Version](http://img.shields.io/packagist/v/toolkit/fsutil.svg)](https://packagist.org/packages/toolkit/fsutil)
 [![Actions Status](https://github.com/php-toolkit/fsutil/workflows/Unit-tests/badge.svg)](https://github.com/php-toolkit/fsutil/actions)
 
-Some useful file system util for php
+Some useful file system util for php.
 
 - basic filesystem operation
 - file read/write operation