Add intructions for Laravel 5.5

Author: sileence

README.md

@@ -18,6 +18,10 @@ This is an extension of the Laravel Collective [HTML package](https://github.com
 
 1. The preferred way to install this package is through Composer:
 
+**Laravel 5.5 users**:
+
+Install by running `composer require "styde/html=~1.4"` or adding `"styde/html": "~1.4"` to your `composer.json` file and then running `composer update`.
+
 **Laravel 5.4 users**:
 
 Install by running `composer require "styde/html=~1.3"` or adding `"styde/html": "~1.3"` to your `composer.json` file and then running `composer update`.