Update README.md

Author: clemensv

README.md

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 # Azure Relay Hybrid Connections for Node.JS
 
-> **Private preview note:**
-> To use the included packages you need to reference them locally or publish 
-> them into a local NPM repository. They are not yet available from the public
-> NPM repositories. 
-
 This repository contains Node packages and samples for the Hybrid Connections feature of the 
 Microsoft Azure Relay, a capability pilar of the Azure Service Bus platform.