add update

src/utils/define.hpp

@@ -7,6 +7,7 @@
   public:\
     void on_attach() override;\
     void render() override;\
+    void update() override;\
     void on_event(VE::event e) override
 
 #define VE_CONNECT(DEF_CLASS) VE::event_manager::instance().connect(std::bind(&DEF_CLASS::on_event, this, std::placeholders::_1));