Update README.md

Author: deliahu

README.md

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+<!-- Delete on release branches -->
 <img src='https://s3-us-west-2.amazonaws.com/cortex-public/logo.png' height='88'>
 
 # Machine learning model serving infrastructure
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 ### Spin up a cluster
 
-Cortex clusters are designed to be self-hosted on any AWS account (GCP support is coming soon):
+Cortex clusters are designed to be self-hosted on any AWS account:
 
 ```bash
 $ cortex cluster up