Use println! in run example

examples/run.rs

@@ -70,7 +70,7 @@ async fn main() {
     // wait for processing results
     let res = rx.recv().await.expect("some calculation result");
 
-    tracing::info!(
+    println!(
         "Send a job with args `vec![5, 8]`. Received result `{}`",
         res
     );