message: Prints error when update or draw returns one
diff: @@ -288,12 +288,14 @@ where
  if let Err(e) = state.update(ctx) {
  error!("Error on EventHandler::update(): {:?}", e);
  + eprintln!("Error on EventHandler::update(): {:?}", e);
  *control_flow = ControlFlow::Exit;
  return;
  }
  if let Err(e) = state.draw(ctx) {
  error!("Error on EventHandler::draw(): {:?}", e);
  + eprintln!("Error on EventHandler::draw(): {:?}", e);
  *control_flow = ControlFlow::Exit;
  return;
  }
  