Method update

examples/backends.rs:39–44

(&mut self, message: Message)

    }

    fn update(&mut self, message: Message) {
        match message {
            Message::PlotA(message) => self.plot_a.update(message),
            Message::PlotB(message) => self.plot_b.update(message),
        }
    }

    fn view(&self) -> Element<'_, Message> {
        row![