Update AgoraView.js

更新适应RN0.40+

AgoraView.js

  * Created by DB on 2017/6/23.
  */
 
-import  React, {Component, PropTypes} from 'react'
+import  React, {Component} from 'react'
+import PropTypes from 'prop-types'
 import {
     requireNativeComponent,
     View,
 
 // AgoraView.name = "AgoraView";
 
-const RCTAgoraView = requireNativeComponent("RCTAgoraView", AgoraView);
+const RCTAgoraView = requireNativeComponent("RCTAgoraView", AgoraView);