update code to work with Symfony 5

Author: MasaakiYoshida

src/DependencyInjection/Configuration.php

@@ -22,8 +22,8 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $treeBuilder->root('phpmentors_session_configuration');
+        $treeBuilder = new TreeBuilder('phpmentors_session_configuration');
+        $treeBuilder->getRootNode();
 
         return $treeBuilder;
     }

src/EventListener/SessionConfigurationListener.php

@@ -15,7 +15,7 @@
 use Symfony\Component\HttpFoundation\Session\SessionInterface;
 use Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage;
 use Symfony\Component\HttpFoundation\Session\Storage\SessionStorageInterface;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
 use Symfony\Component\Routing\RouterInterface;
 
 class SessionConfigurationListener
@@ -41,9 +41,9 @@ public function __construct(RouterInterface $router, SessionStorageInterface $se
     }
 
     /**
-     * @param GetResponseEvent $event
+     * @param RequestEvent $event
      */
-    public function onKernelRequest(GetResponseEvent $event)
+    public function onKernelRequest(RequestEvent $event)
     {
         if ($this->sessionStorage === null) {
             return;