Update README.md

Author: appwiz

README.md

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 Hi! This developer preview is currently under review and we will be looking to merge the contents in the future under a single repository for all AWS React Native functionality. In the meantime, we recommend you leverage the official [AWS JavaScript SDK with React Native support](https://github.com/aws/aws-sdk-js).
 
+-- AWS team (May 24, 2017)
+
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 # AWS SDK for React Native