[BUGFIX] Fix the image URL of the CI status badge (#694)

https://docs.github.com/en/actions/monitoring-and-troubleshooting-workflows/monitoring-workflows/adding-a-workflow-status-badge

Fixes  #665

Author: oliverklee

README.md

@@ -1,6 +1,6 @@
 # PHP CSS Parser
 
-[![Build Status](https://github.com/MyIntervals/PHP-CSS-Parser/workflows/CI/badge.svg?branch=main)](https://github.com/MyIntervals/PHP-CSS-Parser/actions/)
+[![Build Status](https://github.com/MyIntervals/PHP-CSS-Parser/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/MyIntervals/PHP-CSS-Parser/actions/)
 [![Coverage Status](https://coveralls.io/repos/github/MyIntervals/PHP-CSS-Parser/badge.svg?branch=main)](https://coveralls.io/github/MyIntervals/PHP-CSS-Parser?branch=main)
 
 A Parser for CSS Files written in PHP. Allows extraction of CSS files into a data structure, manipulation of said structure and output as (optimized) CSS.