feat: Update README to include TYPO3 v13 badge

Author: Tarik Mellouk

README.md

@@ -3,6 +3,7 @@
 [![Latest Version on Packagist](https://img.shields.io/packagist/v/antwerpes/typo3-docchecklogin.svg?style=flat-square)](https://packagist.org/packages/antwerpes/typo3-docchecklogin)
 [![TYPO3 11](https://img.shields.io/badge/TYPO3-11-orange.svg)](https://get.typo3.org/version/11)
 [![TYPO3 12](https://img.shields.io/badge/TYPO3-12-orange.svg)](https://get.typo3.org/version/12)
+[![TYPO3 12](https://img.shields.io/badge/TYPO3-12-orange.svg)](https://get.typo3.org/version/13)
 [![Total Downloads](https://poser.pugx.org/antwerpes/typo3-docchecklogin/d/total)](https://packagist.org/packages/antwerpes/typo3-docchecklogin)
 [![Monthly Downloads](https://poser.pugx.org/antwerpes/typo3-docchecklogin/d/monthly)](https://packagist.org/packages/antwerpes/typo3-docchecklogin)