chore: fix `README` badge

[![Latest Stable Version](https://img.shields.io/packagist/v/ecphp/cas-lib.svg?style=flat-square)](https://packagist.org/packages/ecphp/cas-lib)

[![GitHub stars](https://img.shields.io/github/stars/ecphp/cas-lib.svg?style=flat-square)](https://packagist.org/packages/ecphp/cas-lib)

[![Total Downloads](https://img.shields.io/packagist/dt/ecphp/cas-lib.svg?style=flat-square)](https://packagist.org/packages/ecphp/cas-lib)

[![GitHub Workflow Status](https://img.shields.io/github/workflow/status/ecphp/cas-lib/Continuous%20Integration?style=flat-square)](https://github.com/ecphp/cas-lib/actions)

[![GitHub Workflow Status][github workflow status]][github actions link]

[![Scrutinizer code quality](https://img.shields.io/scrutinizer/quality/g/ecphp/cas-lib/master.svg?style=flat-square)](https://scrutinizer-ci.com/g/ecphp/cas-lib/?branch=master)

[![Type Coverage](https://shepherd.dev/github/ecphp/cas-lib/coverage.svg)](https://shepherd.dev/github/ecphp/cas-lib)

[![Code Coverage](https://img.shields.io/scrutinizer/coverage/g/ecphp/cas-lib/master.svg?style=flat-square)](https://scrutinizer-ci.com/g/ecphp/cas-lib/?branch=master)

Read more on the dedicated documentation site:

https://ecphp-cas-lib.readthedocs.io/

[github actions link]: https://github.com/ecphp/cas-lib/actions

[github workflow status]:

  https://img.shields.io/github/actions/workflow/status/ecphp/cas-lib/continuous-integration.yml?branch=master&style=flat-square

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