updates require and README.md

Author: Cyril Mizzi

README.md

@@ -17,7 +17,13 @@ provider will be added.
 
 ### Laravel 5.x
 
-Add service provider to `config/app.php` :
+Simply run
+
+```bash
+composer require 'studio-net/laravel-graphql:0.1-beta'
+```
+
+... and add service provider to `config/app.php` :
 
 ```php
 <?php

composer.json

@@ -9,6 +9,7 @@
         }
     ],
     "require": {
+        "laravel/laravel": ">=5.0",
         "webonyx/graphql-php": "^0.9.13",
         "doctrine/dbal": "^2.5"
     },