Update README for Laravel 7

Author: SudoGetBeer

README.md

@@ -1,4 +1,4 @@
-# Messagebird notifications channel for Laravel 5.x & 6
+# Messagebird notifications channel for Laravel 5.x, 6 & 7
 
 [![Latest Version on Packagist](https://img.shields.io/packagist/v/laravel-notification-channels/messagebird.svg?style=flat-square)](https://packagist.org/packages/laravel-notification-channels/messagebird)
 [![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE.md)
@@ -9,7 +9,7 @@
 [![Code Coverage](https://img.shields.io/scrutinizer/coverage/g/laravel-notification-channels/messagebird/master.svg?style=flat-square)](https://scrutinizer-ci.com/g/laravel-notification-channels/messagebird/?branch=master)
 [![Total Downloads](https://img.shields.io/packagist/dt/laravel-notification-channels/messagebird.svg?style=flat-square)](https://packagist.org/packages/laravel-notification-channels/messagebird)
 
-This package makes it easy to send [Messagebird SMS notifications](https://github.com/messagebird/php-rest-api) with Laravel 5.x & 6.
+This package makes it easy to send [Messagebird SMS notifications](https://github.com/messagebird/php-rest-api) with Laravel 5.x, 6 & 7.
 
 ## Contents