Fix Test Badge (#510)

Making test badge appearance pretty

README.md

@@ -2,7 +2,7 @@
 
 [![Latest Version on Packagist](https://img.shields.io/packagist/v/spatie/laravel-tags.svg?style=flat-square)](https://packagist.org/packages/spatie/laravel-tags)
 [![MIT Licensed](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE.md)
-![GitHub Workflow Status](https://img.shields.io/github/workflow/status/spatie/laravel-tags/run-tests?label=tests)
+![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/spatie/laravel-tags/run-tests.yml?label=tests)
 [![Total Downloads](https://img.shields.io/packagist/dt/spatie/laravel-tags.svg?style=flat-square)](https://packagist.org/packages/spatie/laravel-tags)
 
 This package offers taggable behaviour for your models. After the package is installed the only thing you have to do is add the `HasTags` trait to an Eloquent model to make it taggable.