Append state event that pass resolution to DB, update to tokio 1.1

src/client_server/sync.rs

@@ -674,9 +674,10 @@ pub async fn sync_events_route(
         if duration.as_secs() > 30 {
             duration = Duration::from_secs(30);
         }
-        let mut delay = tokio::time::delay_for(duration);
+        let delay = tokio::time::sleep(duration);
+        tokio::pin!(delay);
         tokio::select! {
-            _ = &mut delay => {}
+            _ = &mut delay, if delay.is_elapsed() => {}
             _ = watcher => {}
         }
     }