Update README.md

Author: Chman

README.md

@@ -7,7 +7,7 @@ Instructions
 
 Documentation is available [on the wiki](https://github.com/Unity-Technologies/PostProcessing/wiki).
 
-The current version requires Unity 5.6.1+. Some effects and features are only available on Unity 2017.1+ and Unity 2017.2+.
+The current version requires Unity 5.6.1+. Some effects and features are only available on newer versions of Unity.
 
 License
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