Update README.md

Author: LBeghini

README.md

@@ -21,6 +21,7 @@ Also, to make it easier to download the source code, [releases](https://github.c
 - [x] [State](https://github.com/LBeghini/Java-Design-Patterns/tree/3-state)
 - [x] [Strategy](https://github.com/LBeghini/Java-Design-Patterns/tree/6-strategy)
 - [x] [Template method](https://github.com/LBeghini/Java-Design-Patterns/tree/4-template-method)
+- [ ] [Mediator](https://github.com/LBeghini/Java-Design-Patterns/tree/9-mediator)
 
 ### Creational patterns
 
@@ -38,7 +39,6 @@ Also, to make it easier to download the source code, [releases](https://github.c
 - [ ] Decorator
 - [x] [Facade](https://github.com/LBeghini/Java-Design-Patterns/tree/8-facade)
 - [ ] Flyweight
-- [ ] Mediator
 - [ ] Proxy
 
 ## Technologies