Remove bad print

src/trace_listeners.rs

@@ -146,7 +146,6 @@ impl EventListener {
 }
 impl<S: Subscriber> Layer<S> for EventListener {
     fn on_event(&self, ev: &tracing::Event, _: Context<S>) {
-        println!("event name: {}", ev.metadata().name());
         if !self.filters.matches_metadata(ev.metadata()) {
             return;
         }