refactor(clippy): adapt to new lints

examples/util/event.rs

@@ -44,6 +44,7 @@ impl Events {
             let tx = tx.clone();
             thread::spawn(move || {
                 let stdin = io::stdin();
+                #[allow(clippy::manual_flatten)]
                 for evt in stdin.keys() {
                     if let Ok(key) = evt {
                         if let Err(err) = tx.send(Event::Input(key)) {

examples/util/mod.rs

@@ -37,7 +37,7 @@ impl<'a> StatefulTree<'a> {
             }
             .min(visible.len() - 1)
         });
-        let new_identifier = visible.get(new_index).unwrap().identifier.to_owned();
+        let new_identifier = visible.get(new_index).unwrap().identifier.clone();
         self.state.select(new_identifier);
     }