Theoretically added IE 11 support (can't test)

Author: ww3637

package.json

@@ -29,6 +29,7 @@
       "not op_mini all"
     ],
     "development": [
+      "ie 11",
       "last 1 chrome version",
       "last 1 firefox version",
       "last 1 safari version"

src/index.js

@@ -1,3 +1,6 @@
+import 'react-app-polyfill/ie11';
+import 'react-app-polyfill/stable';
+
 import React from 'react';
 import ReactDOM from 'react-dom';
 import PreRegister from './preregister';