Merge https://github.com/MystikalPooka/Unity-Visual-BEhavior-Tree into UpdateUniRX

Author: MystikalPooka

README.md

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 [![Build Status](https://travis-ci.org/MystikalPooka/Unity-Visual-Behavior-Tree.svg?branch=master)](https://travis-ci.org/MystikalPooka/Unity-Visual-Behavior-Tree)
 # Unity-Visual-Behavior-Tree
 Visual Scripting Behavior Tree Tool for Unity 2017.3.x
 
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+### Requires [uniRX](https://github.com/neuecc/UniRx) - reactive extensions for Unity by nuecc
 
 # **How To Behavior Tree**