Update badge in README [skip ci]

Author: shivammathur

README.md

@@ -1,6 +1,6 @@
 # PHP Ubuntu
 
-<a href="https://github.com/shivammathur/php-ubuntu" title="PHP Package Cache"><img alt="Build status" src="https://github.com/shivammathur/php-ubuntu/workflows/Cache%20PHP/badge.svg"></a>
+<a href="https://github.com/shivammathur/php-ubuntu" title="PHP Package Cache"><img alt="Build status" src="https://github.com/shivammathur/php-ubuntu/workflows/Cache%20PHP%20for%20stable%20versions/badge.svg"></a>
 <a href="https://github.com/shivammathur/php-ubuntu/blob/main/LICENSE" title="license"><img alt="LICENSE" src="https://img.shields.io/badge/license-MIT-428f7e.svg?logo=open%20source%20initiative&logoColor=white&labelColor=555555"></a>
 <a href="https://github.com/shivammathur/php-ubuntu/tree/main/builds" title="builds"><img alt="PHP Versions Supported" src="https://img.shields.io/badge/php-5.6%20to%208.5-777bb3.svg?logo=php&logoColor=white&labelColor=555555"></a>
 <a href="https://cloudsmith.io/~shivammathur/repos/php-ubuntu" title="mirror"><img alt="cloudsmith mirror" src="https://img.shields.io/badge/builds-cloudsmith-blue?logo=cloudsmith"></a>