Update README.md

Author: tibbsa

Diff for: README.md

@@ -4,6 +4,7 @@
 [![Total Downloads](https://img.shields.io/packagist/dt/jamesmills/laravel-notification-rate-limit.svg?style=flat-square)](https://packagist.org/packages/jamesmills/laravel-notification-rate-limit)
 [![Quality Score](https://img.shields.io/scrutinizer/g/jamesmills/laravel-notification-rate-limit.svg?style=flat-square)](https://scrutinizer-ci.com/g/jamesmills/laravel-notification-rate-limit)
 [![StyleCI](https://github.styleci.io/repos/262754309/shield?branch=master)](https://github.styleci.io/repos/262754309)
+[![Tests](https://github.com/jamesmills/laravel-notification-rate-limit/actions/workflows/tests.yml/badge.svg)](https://github.com/jamesmills/laravel-notification-rate-limit/actions/workflows/tests.yml)
 
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 [![Buy us a tree](https://img.shields.io/badge/treeware-%F0%9F%8C%B3-lightgreen?style=flat-square)](https://plant.treeware.earth/jamesmills/laravel-notification-rate-limit)