remove polyfills

client/configuration/polyfills/polyfills.js

@@ -1,6 +0,0 @@
-if (typeof Promise === "undefined") {
-  require("promise/lib/rejection-tracking").enable();
-  window.Promise = require("promise/lib/es6-extensions.js");
-}
-
-require("whatwg-fetch");

client/configuration/webpack/webpack.config.dev.js

@@ -13,7 +13,6 @@ module.exports = {
   entry: [
     "webpack-hot-middleware/client?quiet=true&noInfo=true",
     require.resolve("react-hot-loader/patch"),
-    "babel-polyfill",
     "./src/index"
   ],
   output: {

client/configuration/webpack/webpack.config.prod.js

@@ -17,7 +17,7 @@ module.exports = {
   bail: true,
   cache: false,
   devtool: "cheap-source-map",
-  entry: ["babel-polyfill", "./src/index"],
+  entry: ["./src/index"],
   output: {
     path: path.resolve("build"),
     filename: "static/js/[name].[chunkhash:8].js",