Update README.md

README.md

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 ## PUG Animals
-The PUG: Animals dataset contains 215,040 pre-rendered images using 70 animal assets, 64 environments, 3 sizes, 4 textures, under 4 camera orientations. 
+The PUG: Animals dataset contains 215,040 pre-rendered images based on Unreal-Engine using 70 animal assets, 64 environments, 3 sizes, 4 textures, under 4 camera orientations. 
 It was designed with the intent to create a dataset with variation factors available. Inspired by research on out-of-distribution generalization, PUG: Animals allows one to precisely control distribution shifts between training and testing which can provide better insight on how a deep neural network generalizes on held out variation factors.
 
 ## LICENSE