updated eventdispatcher

libs/Symfony/Component/EventDispatcher/README.md

@@ -1,19 +1,21 @@
 EventDispatcher Component
 =========================
 
-The Symfony2 EventDispatcher component implements the Mediator pattern in a
+The Symfony EventDispatcher component implements the Mediator pattern in a
 simple and effective way to make your projects truly extensible.
 
-    use Symfony\Component\EventDispatcher\EventDispatcher;
-    use Symfony\Component\EventDispatcher\Event;
+```php
+use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\EventDispatcher\Event;
 
-    $dispatcher = new EventDispatcher();
+$dispatcher = new EventDispatcher();
 
-    $dispatcher->addListener('event_name', function (Event $event) {
-        // ...
-    });
+$dispatcher->addListener('event_name', function (Event $event) {
+    // ...
+});
 
-    $dispatcher->dispatch('event_name');
+$dispatcher->dispatch('event_name');
+```
 
 Resources
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