Add the 'fullscreenchange' event (#370)

* Add the 'fullscreenchange' event

* API Fixe

Author: ryanisaacg

src/lib.rs

@@ -336,6 +336,8 @@ pub mod web {
             UnloadEvent,
             BeforeUnloadEvent,
 
+            FullscreenChangeEvent,
+
             EventPhase
         };
 

src/webapi/event.rs

@@ -236,6 +236,17 @@ pub struct UnloadEvent( Reference );
 
 impl IEvent for UnloadEvent {}
 
+/// The 'FullscreenChange' event fires when an element enters or exits fullscreen
+///
+/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/Document/fullscreenchange_event)
+// https://fullscreen.spec.whatwg.org/#handler-document-onfullscreenchange
+#[derive(Clone, Debug, PartialEq, Eq, ReferenceType)]
+#[reference(instance_of = "Event")]
+#[reference(event = "fullscreenchange")]
+pub struct FullscreenChangeEvent( Reference );
+
+impl IEvent for FullscreenChangeEvent {}
+
 /// The `IUiEvent` interface represents simple user interface events.
 ///
 /// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/UIEvent)