Update README.md

Author: marcb152

README.md

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 # Wind-Creator
-Some scripts to add wind to any tree and grass in Unity (built-in)
+This repo contains some scripts to add wind to any tree and grass in Unity, built-in render pipeline only, needs Unity 2019.3 or newer to fully work.
+It's a continuation from this thread: https://forum.unity.com/threads/how-to-add-wind-to-custom-trees-grass-in-unity-using-tree-creator-shaders.871126/