docs: update README

Author: bang9

packages/uikit-chat-hooks/README.md

@@ -1,6 +1,6 @@
 # @sendbird/uikit-chat-hooks
 
-React custom hooks with Sendbird Chat SDK v3, made for UIKit
+React custom hooks with Sendbird Chat SDK v4, made for UIKit
 
 ## Installation
 

packages/uikit-react-native/README.md

@@ -46,7 +46,7 @@ UIKit for React-Native can be installed through either `yarn` or `npm`
 
 ```sh
 npm i @sendbird/uikit-react-native \
-      sendbird \
+      @sendbird/chat \
       date-fns \
       react-native-safe-area-context \
       @react-native-community/netinfo