Update README.md

Co-Authored-By: Hunar Roop Kahlon <[email protected]>

README.md

@@ -95,7 +95,7 @@ To create a new random (V4) UUID and print it out in hexadecimal form:
 
 use uuid::Uuid;
 
-fn main() {
+fn main() -> Result<(), Box<std::error::Error> {
     let my_uuid = Uuid::new_v4().unwrap();
     println!("{}", my_uuid);
 }