Update README.md

Author: komorra

README.md

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 Node Editor Winforms
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 ![Example of Node Editor usage in 3D application](http://i.imgur.com/GDJG8pf.png)
 
 ## Changelog
+* 2021.02.06 - Added ability to use string type parameters in node inputs and outputs directly, without need to create wrapper class
 * 2021.01.24 - Added ability to access nodes custom editors via CustomEditor property of NodeVisual
 * 2021.01.24 - Fixed method of resolving assemblies (which fixed for example usage of generic types in sockets, like List<T>)
 * 2021.01.24 - Added support for customizing node width and height - via Node attribute parameters