create-react-app already provides a polyfill for Fetch (#3)

react-ui/package.json

@@ -7,8 +7,7 @@
   },
   "dependencies": {
     "react": "^15.4.2",
-    "react-dom": "^15.4.2",
-    "whatwg-fetch": "^2.0.2"
+    "react-dom": "^15.4.2"
   },
   "scripts": {
     "start": "react-scripts start",

react-ui/src/App.js

@@ -1,12 +1,11 @@
 import React, { Component } from 'react';
 import logo from './logo.svg';
-import 'whatwg-fetch';
 import './App.css';
 
 class App extends Component {
   constructor(props) {
     super(props);
-    this.state = { 
+    this.state = {
       message: null,
       fetching: true
     };