migrate ci to github actions (#367)

server-sent-events/src/main.rs

@@ -75,7 +75,7 @@ impl Broadcaster {
     fn spawn_ping(me: Data<Mutex<Self>>) {
         actix_web::rt::spawn(async move {
             let mut task = interval_at(Instant::now(), Duration::from_secs(10));
-            while let Some(_) = task.next().await {
+            while task.next().await.is_some() {
                 me.lock().unwrap().remove_stale_clients();
             }
         })