fixed broken link of Crystal AI and Rain AI

Author: shohan4556

README.md

@@ -48,8 +48,8 @@ Thanks to all the [contributors](https://github.com/ryannielson/awesome-unity/gr
 
 * [A* Pathfinding Project](http://arongranberg.com/astar/) - Lightning fast pathfinding with heavily optimized algorithms and a large feature set.
 * [Apex Path (Paid)](https://www.assetstore.unity3d.com/en/#!/content/17943) - Apex Path handles dynamic pathfinding including local avoidance steering and dynamic obstacles.
-* [Crystal AI](https://theldoctor.github.io/CrystalAI/) - Crystal is a fast, scalable and extensible utility based AI framework for C# and Unity.
-* [Rain](http://rivaltheory.com/rain) - A toolset that provides integrated AI rigging, a visual behavior tree editor,  pathfinding, automatic nav grid generation, and more.
+* [Crystal AI](https://github.com/igiagkiozis/CrystalAI) - Crystal is a fast, scalable and extensible utility based AI framework for C# and Unity.
+* [Rain](https://assetstore.unity.com/packages/tools/ai/rain-ai-for-unity-23569) - A toolset that provides integrated AI rigging, a visual behavior tree editor,  pathfinding, automatic nav grid generation, and more.
 
 
 ## Augmented & Virtual Reality