fix: Call the correct session setter in Laravel 5.4 (dingo#1412)

* Call the correct session setter in Laravel 5.4

The http session is refactored in Laravel 5.4. The session handlers no longer implements Symfony's SessionInterface. 
Check links as below,
laravel/framework#17064
https://laravel.com/docs/5.4/upgrade

* "dist: trusty" for HHVM

.travis.yml

@@ -1,6 +1,7 @@
 language: php
 
 sudo: false
+dist: trusty
 
 env:
   global:

src/Http/Request.php

@@ -37,7 +37,7 @@ public function createFromIlluminate(IlluminateRequest $old)
         );
 
         if ($session = $old->getSession()) {
-            $new->setSession($old->getSession());
+            $new->setLaravelSession($old->getSession());
         }
 
         $new->setRouteResolver($old->getRouteResolver());