Note about serve

AFAICR, `serve` was removed the core. Check laravel/laravel@80fb944

Author: srph

_posts/01-03-01-Built-in-Web-Server.md

@@ -12,7 +12,7 @@ You might notice a server.php in the Laravel codes. The purpose of this is for y
 > php -S localhost:8000 server.php
 {% endhighlight %}
 
-or simply
+or simply (note that the following **only** works for Laravel `v4.x`):
 
 {% highlight console %}
 > php artisan serve
@@ -22,4 +22,4 @@ You can also specify optional parameters
 
 {% highlight console %}
 > php artisan serve --port=8080 --host=local.dev
-{% endhighlight %}
+{% endhighlight %}