Update DistributeTokensStep component and tests

config/polyfills.js

@@ -14,3 +14,5 @@ require('whatwg-fetch');
 // Object.assign() is commonly used with React.
 // It will use the native implementation if it's present and isn't buggy.
 Object.assign = require('object-assign');
+
+require('babel-polyfill')

package-lock.json

@@ -1379,6 +1379,34 @@
         "babel-types": "6.26.0"
       }
     },
+    "babel-polyfill": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-polyfill/-/babel-polyfill-6.26.0.tgz",
+      "integrity": "sha1-N5k3q8Z9eJWXCtxiHyhM2WbPIVM=",
+      "requires": {
+        "babel-runtime": "6.26.0",
+        "core-js": "2.5.3",
+        "regenerator-runtime": "0.10.5"
+      },
+      "dependencies": {
+        "babel-runtime": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
+          "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
+          "requires": {
+            "core-js": "2.5.3",
+            "regenerator-runtime": "0.11.1"
+          },
+          "dependencies": {
+            "regenerator-runtime": {
+              "version": "0.11.1",
+              "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz",
+              "integrity": "sha512-MguG95oij0fC3QV3URf4V2SDYGJhJnJGqvIIgdECeODCT98wSWDAJ94SSuVpYQUoTcGUIL6L4yNB7j1DFFHSBg=="
+            }
+          }
+        }
+      }
+    },
     "babel-preset-env": {
       "version": "1.6.1",
       "resolved": "https://registry.npmjs.org/babel-preset-env/-/babel-preset-env-1.6.1.tgz",

package.json

@@ -44,6 +44,7 @@
     "babel-jest": "20.0.3",
     "babel-loader": "7.0.0",
     "babel-plugin-transform-decorators-legacy": "^1.3.4",
+    "babel-polyfill": "^6.26.0",
     "babel-preset-es2015": "^6.24.1",
     "babel-preset-react-app": "^3.0.1",
     "babel-preset-stage-1": "^6.24.1",