Update README.md

README.md

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 # ZipPlus2048 Model Card
-**A pre-trained 2-layer GRU model for neural file compression. Compress any file into a PNG image using a neural network and extract it back.**
+**A pre-trained 4-layer GRU model for neural file compression. Compress any file into a PNG image using a neural network and extract it back.**
 This is a pre-trained ByteGRU model for [Zip+](https://github.com/CompactAIOfficial/ZipPlus) - use this instead of training your own.
 
 ## What is this