message: Update main.rs
  Do a proper shutdown upon a SIGHUP in the example main.
diff: @@ -72,6 +72,8 @@ async fn run(config: Config) -> Result<(), Error> {
  .context("Failed to install sigint handler")?;
  let mut sigterm = tokio::signal::unix::signal(SignalKind::terminate())
  .context("Failed to install sigterm handler")?;
  + let mut sighup = tokio::signal::unix::signal(SignalKind::hangup())
  + .context("Failed to install sighup handler")?;
  let status = select! {
  _ = sigint.recv() => {
  @@ -82,6 +84,10 @@ async fn run(config: Config) -> Result<(), Error> {
  info!("Received SIGTERM. Stopping Northstar runtime");
  runtime.shutdown().await
  }
  + _ = sighup.recv() => {
  + info!("Received SIGHUP. Stopping Northstar runtime");
  + runtime.shutdown().await
  + }
  status = &mut runtime => status,
  };
  match status {
  