Update laravel required version

Christoph Rumpel · Christoph Rumpel · commit dc3410cfd031 · 2017-06-13T20:41:47.000+02:00
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-# Twitter notification channel for Laravel 5.4
+# Twitter notification channel for Laravel 5.3+
 
 [![Latest Version on Packagist](https://img.shields.io/packagist/v/laravel-notification-channels/twitter.svg?style=flat-square)](https://packagist.org/packages/laravel-notification-channels/twitter)
 [![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE.md)

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-# Twitter notification channel for Laravel 5.4`
	`1`	`+# Twitter notification channel for Laravel 5.3+`
`2`	`2`
`3`	`3`	`[![Latest Version on Packagist](https://img.shields.io/packagist/v/laravel-notification-channels/twitter.svg?style=flat-square)](https://packagist.org/packages/laravel-notification-channels/twitter)`
`4`	`4`	`[![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE.md)`