[animate] update

src/main/hw/animate/IAnimate.hx

@@ -1,10 +1,12 @@
 package hw.animate;
 
+import promhx.Promise;
+
 interface IAnimate {
 
-    public function start(callback:IAnimate -> Void, custom:Bool = false):Void;
+    public function start():Promise<IAnimate>;
 
     public function cancel():Void;
 
-    private function update(time:Float):Void;
+    public function update(time:Float):Bool;
 }