update with clippy errors

yaserde/src/de/mod.rs

@@ -45,7 +45,7 @@ impl<'de, R: Read> Deserializer<R> {
     }
 
     if let Some(ref next) = self.peeked {
-      Ok(&next)
+      Ok(next)
     } else {
       Err(String::from("unable to peek next item"))
     }