Update README.md

Author: ospillinger

README.md

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 # Machine learning model serving infrastructure
 
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 * **Multi framework:** deploy TensorFlow, PyTorch, scikit-learn, and other models.
 * **Autoscaling:** automatically scale APIs to handle production workloads.
-* **CPU / GPU support:** run inference on CPU or GPU instances.
+* **ML instances:** run inference on G4, P2, M5, C5 and other AWS instance types.
 * **Spot instances:** save money with spot instances.
 * **Rolling updates:** update deployed APIs with no downtime.
 * **Log streaming:** stream logs from deployed models to your CLI.