Update lib.rs

plugins/fs-watch/src/lib.rs

@@ -91,7 +91,7 @@ async fn watch<R: Runtime>(
 
     let watcher = if let Some(delay) = options.delay_ms {
         let (tx, rx) = channel();
-        let mut debouncer = new_debouncer(Duration::from_millis(delay), None, tx)?;
+        let mut debouncer = new_debouncer(Duration::from_millis(delay), tx)?;
         let watcher = debouncer.watcher();
         for path in &paths {
             watcher.watch(path, mode)?;