terminal-wait-exit

等待用户退出终端，如Ctrl+C。

用法

#[tokio::main]
async fn main() {
    // Spawn the server into a runtime
    tokio::spawn(async move {
        // work
        server.serve(service).await;
    });

    if let Err(e) = wait_exit::wait_exit().await {
        error!("Listening exit failed.{:?}", e);
    }

    stop_graceful();
}