message: Center items in `counter` example
diff: -use iced::{button, Button, Column, Element, Sandbox, Settings, Text};
  +use iced::{button, Align, Button, Column, Element, Sandbox, Settings, Text};
  pub fn main() {
  Counter::run(Settings::default())
  @@ -42,6 +42,7 @@ impl Sandbox for Counter {
  fn view(&mut self) -> Element<Message> {
  Column::new()
  .padding(20)
  + .align_items(Align::Center)
  .push(
  Button::new(&mut self.increment_button, Text::new("Increment"))
  .on_press(Message::IncrementPressed),
  