update fetch

Author: hzbdesigner

package.json

@@ -30,7 +30,7 @@
     "ledgerco": "1.2.1",
     "lodash": "4.17.5",
     "socket.io-client": "2.0.4",
-    "whatwg-fetch": "^2.0.4"
+    "isomorphic-fetch": "2.2.1"
   },
   "devDependencies": {
     "babel-core": "^6.26.3",

src/common/request.js

@@ -1,4 +1,4 @@
-import 'whatwg-fetch';
+import 'isomorphic-fetch';
 import crypto from 'crypto';
 
 const headers = {