fix: 添加fetch补丁

package.json

@@ -294,7 +294,7 @@
         "webpack-manifest-plugin": "^3.0.0",
         "webpack-theme-color-replacer": "^1.3.15",
         "webpackbar": "5.0.0-3",
-        "whatwg-fetch": "3.0.0",
+        "whatwg-fetch": "^3.0.0",
         "yorkie": "^2.0.0",
         "zlib": "^1.0.5"
     }

src/app.js

@@ -12,7 +12,7 @@ import 'sanitize.css/sanitize.css';
 // import './vm';
 import React from 'react';
 import ReactDOM from 'react-dom';
-
+import 'whatwg-fetch';
 import { Button, ConfigProvider, message, notification } from 'antd';
 import { ConnectedRouter } from 'connected-react-router/immutable';
 import Immutable from 'immutable';