title: react-native-picker not working on react-native version 0.63.2
body: <p>I upgraded react-native version to <code>0.63.2</code>. Then I have a problem on Android app.</p>
  <p>Android app show empty screen.</p>
  <p>The error is as following:</p>
  <pre><code>Warning: Picker has been extracted from react-native core and will be removed in a future release. 
  It can now be installed and imported from '@react-native-community/picker' instead of 'react-native'. 
  See https://github.com/react-native-community/react-native-picker
  ERROR    TypeError: Super expression must either be null or a function
  ERROR    Invariant Violation: Module AppRegistry is not a registered callable module (calling runApplication)
  ERROR    Invariant Violation: Module AppRegistry is not a registered callable module (calling runApplication)
  </code></pre>
  <p>How can I solve this problem?</p>