update PropTypes import

Author: erichua23

index.js

@@ -1,12 +1,13 @@
 
-import React, { Component, PropTypes } from 'react';
+import React, { Component } from 'react';
 
 import {
   NativeModules,
   TextInput,
   findNodeHandle,
   AppRegistry,
 } from 'react-native';
+import PropTypes from 'prop-types'
 
 const { CustomKeyboard} = NativeModules;