Merge pull request #656 from prymitive/fetch-polyfill

fix(ui): re-add fetch polyfill for older browsers

ui/src/index.js

@@ -1,5 +1,7 @@
 // MUST be first thing we import
 // https://github.com/facebook/create-react-app/blob/master/packages/react-app-polyfill/README.md
+// IE is not supported (lacks Proxy) but that pollyfill provides fetch and other needed features
+import 'react-app-polyfill/ie11';
 import "react-app-polyfill/stable";
 
 import React from "react";