Update README.md with new coverall badget

Author: pitbulk

README.md

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 # SAML PHP Toolkit
 
-[![php-saml package](https://github.com/SAML-Toolkits/php-saml/actions/workflows/php-package.yml/badge.svg?branch=master)](https://github.com/SAML-Toolkits/php-saml/actions/workflows/php-package.yml) [![Coverage Status](https://coveralls.io/repos/onelogin/php-saml/badge.png)](https://coveralls.io/r/onelogin/php-saml) ![Packagist Dependency Version (specify version)](https://img.shields.io/packagist/dependency-v/onelogin/php-saml/php?version=2.19.1) [![License](https://poser.pugx.org/onelogin/php-saml/license.png)](https://packagist.org/packages/onelogin/php-saml) ![Packagist Downloads](https://img.shields.io/packagist/dm/onelogin/php-saml) ![Packagist Downloads](https://img.shields.io/packagist/dt/onelogin/php-saml?label=Total%20downloads)
+[![php-saml package](https://github.com/SAML-Toolkits/php-saml/actions/workflows/php-package.yml/badge.svg?branch=master)](https://github.com/SAML-Toolkits/php-saml/actions/workflows/php-package.yml) [![Coverage Status](https://coveralls.io/repos/github/SAML-Toolkits/php-saml/badge.svg?branch=master)](https://coveralls.io/github/SAML-Toolkits/php-saml?branch=master) ![Packagist Dependency Version (specify version)](https://img.shields.io/packagist/dependency-v/onelogin/php-saml/php?version=2.19.1) [![License](https://poser.pugx.org/onelogin/php-saml/license.png)](https://packagist.org/packages/onelogin/php-saml) ![Packagist Downloads](https://img.shields.io/packagist/dm/onelogin/php-saml) ![Packagist Downloads](https://img.shields.io/packagist/dt/onelogin/php-saml?label=Total%20downloads)
 
 Add SAML support to your PHP software using this library.