Update badge in readme

Author: ADmad

README.md

@@ -1,6 +1,6 @@
 # Slug
 
-[![Build Status](https://img.shields.io/travis/UseMuffin/Slug/master.svg?style=flat-square)](https://travis-ci.org/UseMuffin/Slug)
+[![Build Status](https://img.shields.io/github/workflow/status/UseMuffin/Slug/CI/master)](https://github.com/UseMuffin/Slug/actions)
 [![Coverage](https://img.shields.io/codecov/c/github/UseMuffin/Slug/master.svg?style=flat-square)](https://codecov.io/github/UseMuffin/Slug)
 [![Total Downloads](https://img.shields.io/packagist/dt/muffin/slug.svg?style=flat-square)](https://packagist.org/packages/muffin/slug)
 [![License](https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square)](LICENSE)