Remove old build status badge from README

Updated build status badge to reflect new workflow.

Author: szepeviktor

README.md

@@ -11,7 +11,6 @@ Thank you!
 
 [![Packagist stats](https://img.shields.io/packagist/dt/php-stubs/wordpress-stubs.svg)](https://packagist.org/packages/php-stubs/wordpress-stubs/stats)
 [![Packagist](https://img.shields.io/packagist/v/php-stubs/wordpress-stubs.svg?color=4CC61E&style=popout)](https://packagist.org/packages/php-stubs/wordpress-stubs)
-[![Build Status](https://github.com/php-stubs/wordpress-stubs/workflows/Tests/badge.svg)](https://github.com/php-stubs/wordpress-stubs/actions)
 [![Build Status](https://github.com/php-stubs/wordpress-stubs/actions/workflows/integrate.yml/badge.svg)](https://github.com/php-stubs/wordpress-stubs/actions)
 
 It provides stub declarations for [WordPress](https://wordpress.org/)