Update README.md

Author: rboonzaijer

README.md

@@ -7,6 +7,16 @@
 <a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://img.shields.io/github/actions/workflow/status/rboonzaijer/php-array-to-xml/tests.yml?branch=main"></a>
 <a href="https://github.com/rboonzaijer/php-array-to-xml/blob/main/LICENSE.md"><img src="https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square" alt="License"></a>
 <a href="https://packagist.org/packages/rboonzaijer/php-array-to-xml"><img src="https://img.shields.io/packagist/php-v/rboonzaijer/php-array-to-xml?style=flat-square"></a>
+  <br>
+  <br>
+  <a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-7.0-green?label=php&style=flat-square"></a>
+<a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-7.1-green?label=php&style=flat-square"></a>
+<a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-7.2-green?label=php&style=flat-square"></a>
+<a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-7.3-green?label=php&style=flat-square"></a>
+<a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-7.4-green?label=php&style=flat-square"></a>
+<a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-8.0-green?label=php&style=flat-square"></a>
+<a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-8.1-green?label=php&style=flat-square"></a>
+  
 </p>