Update book web page

It was pointing to legacy version

Author: lwjglgamedev

README.md

@@ -1,5 +1,5 @@
 # lwjglbook
 
-This repository holds the source code of the chapters of the book [3D Game Development with LWJGL 3 ](https://www.gitbook.com/book/lwjglgamedev/3d-game-development-with-lwjgl/details)
+This repository holds the source code of the chapters of the book [3D Game Development with LWJGL 3](https://ahbejarano.gitbook.io/lwjglgamedev/)
 
 Source code is licensed under [Apache v2.0](https://www.apache.org/licenses/LICENSE-2.0 "Apache v2.0")