Add Zap integration to README features list (#252)

Author: just1and0

README.md

@@ -113,6 +113,7 @@ const Checkout = () => {
 - ✅ Fully typed params for transactions
 - ✅ Works seamlessly with Expo & bare React Native
 - ✅ Full test coverage
+- ✅ Zap integration
 
 ---