Add notice

Author: koenhoeijmakers

readme.md

@@ -1,7 +1,8 @@
+> Pull request [#21885](https://github.com/laravel/framework/pull/21885) on the framework's repository has made this package obsolete  as Argon2 hashing will be added in Laravel's [5.6] release.
+
 # Laravel Argon2
 [![Packagist](https://img.shields.io/packagist/v/koenhoeijmakers/laravel-argon2.svg?colorB=brightgreen)](https://packagist.org/packages/koenhoeijmakers/laravel-argon2)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/koenhoeijmakers/laravel-argon2/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/koenhoeijmakers/laravel-argon2/?branch=master)
-[![Code Climate](https://img.shields.io/codeclimate/github/koenhoeijmakers/laravel-argon2.svg)](https://codeclimate.com/github/koenhoeijmakers/laravel-argon2)
 [![license](https://img.shields.io/github/license/koenhoeijmakers/laravel-argon2.svg?colorB=brightgreen)](https://github.com/koenhoeijmakers/laravel-argon2)
 [![Packagist](https://img.shields.io/packagist/dt/koenhoeijmakers/laravel-argon2.svg?colorB=brightgreen)](https://packagist.org/packages/koenhoeijmakers/laravel-argon2)