Update README.md

Author: iujames

README.md

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 # Appcues Expo Module
 
-> **This is a pre-release alpha package in preparation for v4 of the Appcues SDK. It is not necessary for integrating v3 of the Appcues SDK. Please refer to the [Appcues React Native Module](https://github.com/appcues/appcues-react-native-module).**
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 Appcues Expo Module allows you to integrate Appcues push notifications into your Expo app alongside the [Appcues React Native Module](https://github.com/appcues/appcues-react-native-module).
 
 - [Appcues Expo Module](#appcues-expo-module)