Update KeyboardAwareMixin.js

Author: ozsirma

lib/KeyboardAwareMixin.js

@@ -1,6 +1,6 @@
 /* @flow */
 
-import { PropTypes } from 'react'
+import PropTypes from 'prop-types'
 import ReactNative, { TextInput, Keyboard, UIManager } from 'react-native'
 import TimerMixin from 'react-timer-mixin'