Tweak conclusion slide.

src/cartoon.rs

@@ -63,7 +63,7 @@ fn create_slides() -> Vec<Box<dyn Slide>> {
         Box::new(Fractals::default()),
         Box::new(Computation::default()),
         Box::new(Watercolor::default()),
-        Box::new(Conclusion::default()),
+        Box::new(Conclusion::default()), // <--- YOU ARE HERE :)
     ]
 }