Update README.md

Author: coryleach

README.md

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+```
 A C# json reader/writer which is Unity3D compatible based on http://wiki.unity3d.com/index.php/SimpleJSON
 The official Github repo for this script can be found at https://github.com/Bunny83/SimpleJSON/blob/master/SimpleJSON.cs
 Original improvements from https://github.com/HenrikPoulsen/SimpleJSON
 This repository is a fork that has been updated for direct import with the Unity PackageManager.
+```
 
 ## Quick Package Install