Update README.md

Author: vinkla

README.md

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 ![oauth2-server-laravel](https://cloud.githubusercontent.com/assets/499192/9065550/751404ba-3ad2-11e5-9f92-3d4d5d4b9c54.png)
 
+> **Note:** This package is no longer maintaned for Laravel 5.3+ since Laravel now features the [Passport package](https://laravel.com/docs/passport).
+
 [OAuth 2.0](http://tools.ietf.org/wg/oauth/draft-ietf-oauth-v2/) authorization server and resource server for the Laravel and Lumen frameworks. Standard compliant thanks to the amazing work by [The League of Extraordinary Packages](http://www.thephpleague.com) OAuth 2.0 authorization server and resource server.
 
 [![Latest Version](http://img.shields.io/github/release/lucadegasperi/oauth2-server-laravel.svg?style=flat-square)](https://github.com/lucadegasperi/oauth2-server-laravel/releases)