Picker has been extracted from react-native core

README.md

@@ -55,6 +55,10 @@ npm install native-base --save
 *Install Peer Dependencies:*<br />
 The peer dependencies included from any npm packages does not automatically get installed. Your application will not depend on it explicitly.
 
+```js
+npm install @react-native-community/picker --save
+```
+
 ```js
 react-native link
 ```
@@ -72,6 +76,10 @@ Refer this link for additional information on [Expo](https://docs.expo.io/)
 ```js
 npm install native-base --save
 ```
+*Install peerDependencies:*
+```js
+npm install @react-native-community/picker --save
+```
 
 <br />