implementing PlayNext media

src/argparse.rs

@@ -81,7 +81,7 @@ pub fn parse() -> Arguments {
     if urls.len() > 1 {
         arguments.urls = Some(urls);
     } else {
-        urls.truncate(1);
+        urls.truncate(1); //does nothing because urls is of len 0 or 1 in this case.
         arguments.url_opt = urls.pop();
     }