Remove unnecessary Debug trait from example

examples/custom_types_and_methods.rs

@@ -1,7 +1,7 @@
 extern crate rhai;
 use rhai::{Engine, FnRegister};
 
-#[derive(Debug, Clone)]
+#[derive(Clone)]
 struct TestStruct {
     x: i32
 }
@@ -27,4 +27,4 @@ fn main() {
     if let Ok(result) = engine.eval::<TestStruct>("var x = new_ts(); x.update(); x") {
         println!("result: {}", result.x); // prints 1001
     }
-}
+}