Clean up trailing space and fix rhai_runner print out

examples/rhai_runner.rs

@@ -23,7 +23,7 @@ fn main() {
 
         match engine.eval_file::<()>(&fname) {
             Ok(_) => (),
-            Err(e) => {println!("Error: {:?}", e)}
+            Err(e) => {println!("Error: {}", e)}
         }
     }
 }

examples/simple_fn.rs

@@ -9,7 +9,7 @@ fn main() {
     let mut engine = Engine::new();
 
     engine.register_fn("add", add);
- 
+
     if let Ok(result) = engine.eval::<i32>("add(40, 2)") {
        println!("Answer: {}", result);  // prints 42
     }