Update outdated badge in README.md

Author: const-cloudinary

README.md

@@ -1,4 +1,7 @@
-[![Build Status](https://app.travis-ci.com/cloudinary/cloudinary_php.svg)](https://app.travis-ci.com/cloudinary/cloudinary_php) [![license](https://img.shields.io/github/license/cloudinary/cloudinary_php.svg?maxAge=2592000)](https://github.com/cloudinary/cloudinary_php/blob/master/LICENSE) [![Packagist](https://img.shields.io/packagist/v/cloudinary/cloudinary_php.svg?maxAge=2592000)](https://packagist.org/packages/cloudinary/cloudinary_php) [![Packagist](https://img.shields.io/packagist/dt/cloudinary/cloudinary_php.svg?maxAge=2592000)](https://packagist.org/packages/cloudinary/cloudinary_php/stats)
+[![Tests](https://github.com/cloudinary/cloudinary_php/actions/workflows/test.yaml/badge.svg)](https://github.com/cloudinary/cloudinary_php/actions/workflows/test.yaml)
+[![license](https://img.shields.io/github/license/cloudinary/cloudinary_php.svg?maxAge=2592000)](https://github.com/cloudinary/cloudinary_php/blob/master/LICENSE)
+[![Packagist](https://img.shields.io/packagist/v/cloudinary/cloudinary_php.svg?maxAge=2592000)](https://packagist.org/packages/cloudinary/cloudinary_php)
+[![Packagist](https://img.shields.io/packagist/dt/cloudinary/cloudinary_php.svg?maxAge=2592000)](https://packagist.org/packages/cloudinary/cloudinary_php/stats)
 
 Cloudinary PHP SDK
 ==================