message: docs(examples): Update the example hello
diff: @@ -5,19 +5,21 @@ extern crate pretty_env_logger;
  use hyper::{Body, Request, Response, Server};
  use hyper::service::{make_service_fn, service_fn};
  -use hyper::rt;
  async fn hello(_: Request<Body>) -> Result<Response<Body>, hyper::Error> {
  Ok(Response::new(Body::from("Hello World!")))
  }
  -async fn serve() {
  +#[tokio::main]
  +pub async fn main() -> Result<(), Box<dyn std::error::Error>> {
  + pretty_env_logger::init();
  +
  let addr = ([127, 0, 0, 1], 3000).into();
  let server = Server::bind(&addr)
  .serve(make_service_fn(|_| {
  // This is the `Service` that will handle the connection.
  - // `service_fn_ok` is a helper to convert a function that
  + // `service_fn` is a helper to convert a function that
  // returns a Response into a `Service`.
  async {
  Ok::<_, hyper::Error>(service_fn(hello))
  @@ -26,13 +28,7 @@ async fn serve() {
  println!("Listening on http://{}", addr);
  - if let Err(e) = server.await {
  - eprintln!("server error: {}", e);
  - }
  -}
  -
  -fn main() {
  - pretty_env_logger::init();
  + server.await?;
  - rt::run(serve());
  + Ok(())
  }
  