Update README.md

Removing prototype as deprecated

Author: Swinkid

README.md

@@ -79,7 +79,6 @@ Thanks to all the [contributors](https://github.com/ryannielson/awesome-unity/gr
 * [TouchScript](https://github.com/TouchScript/TouchScript) - Makes handling complex gesture interactions on any touch surface much easier.
 
 ## Modeling
-* [Prototype](https://www.assetstore.unity3d.com/en/#!/content/11919) - Uses the core of ProBuilder, enabling you to build entire game levels (or objects) with speed and simplicity.
 * [SabreCSG](http://sabrecsg.com/) - A set of [CSG](https://en.wikipedia.org/wiki/Constructive_solid_geometry) level design tools for building complex levels quickly inside Unity. 
 
 ## Monetization