message: Fix events example
diff: @@ -43,6 +43,8 @@ fn main() {
  window.set_cursor_pos_polling(true);
  window.set_cursor_enter_polling(true);
  window.set_scroll_polling(true);
  + window.set_maximize_polling(true);
  + window.set_content_scale_polling(true);
  // Alternatively, all event types may be set to poll at once. Note that
  // in this example, this call is redundant as all events have been set
  @@ -91,5 +93,7 @@ fn handle_window_event(window: &mut glfw::Window, (time, event): (f64, glfw::Win
  }
  }
  glfw::WindowEvent::FileDrop(paths) => println!("Time: {:?}, Files dropped: {:?}", time, paths),
  + glfw::WindowEvent::Maximize(maximized) => println!("Time: {:?}, Window maximized: {:?}.", time, maximized),
  + glfw::WindowEvent::ContentScale(xscale, yscale) => println!("Time: {:?}, Content scale x: {:?}, Content scale y: {:?}", time, xscale, yscale),
  }
  }
  