Fix slides link (#5424)

Author: davidkpiano

README.md

@@ -197,7 +197,7 @@ toggleActor.send({ type: 'TOGGLE' });
 
 Statecharts are a formalism for modeling stateful, reactive systems. This is useful for declaratively describing the _behavior_ of your application, from the individual components to the overall application logic.
 
-Read [📽 the slides](http://slides.com/davidkhourshid/finite-state-machines) ([🎥 video](https://www.youtube.com/watch?v=VU1NKX6Qkxc)) or check out these resources for learning about the importance of finite state machines and statecharts in user interfaces:
+Read [📽 the slides](http://slides.com/davidkpiano/finite-state-machines) ([🎥 video](https://www.youtube.com/watch?v=VU1NKX6Qkxc)) or check out these resources for learning about the importance of finite state machines and statecharts in user interfaces:
 
 - [Statecharts - A Visual Formalism for Complex Systems](https://www.sciencedirect.com/science/article/pii/0167642387900359/pdf) by David Harel
 - [The World of Statecharts](https://statecharts.github.io/) by Erik Mogensen