Update README.md

Author: jchanvfx

README.md

@@ -7,7 +7,7 @@
 
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-NodeGraphQt is a node graph framework for PySide2 that can be implemented and re-purposed into 
+NodeGraphQt is a node graph UI framework for PySide2 that can be implemented and re-purposed into 
 applications.
 
 <img src="/docs/_images/screenshot.png" width="100%" title="NodeGraphQt">