Replace PropTypes from react with form prop-types package (#677)

Video.js

@@ -1,4 +1,5 @@
-import React, {Component, PropTypes} from 'react';
+import React, {Component} from 'react';
+import PropTypes from 'prop-types';
 import {StyleSheet, requireNativeComponent, NativeModules, View, Image} from 'react-native';
 import resolveAssetSource from 'react-native/Libraries/Image/resolveAssetSource';
 import VideoResizeMode from './VideoResizeMode.js';