Update README.md

Author: Makisuo

README.md

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 [Superwall](https://superwall.com/) lets you remotely configure every aspect of your paywall — helping you find winners quickly.
 
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+> **⚠️ DEPRECATED**
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+> This sdk is deprecated and no longer maintained. Please use our new and improve expo sdk instead:
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+> **👉 [superwall-expo](https://github.com/superwall/superwall-expo)**
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 ## Superwall
 
 **Superwall** is an open source framework that provides a wrapper for presenting and creating paywalls. It interacts with the Superwall backend letting you easily iterate paywalls on the fly in `React Native`!