chore(package): update es6-promise to version 4.0.2

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -42,7 +42,7 @@
     "sinon-chai": "^2.8.0"
   },
   "devDependencies": {
-    "es6-promise": "^3.0.2",
+    "es6-promise": "^4.0.2",
     "eslint": "^3.5.0",
     "jquery": "^3.1.0",
     "karma": "^1.3.0",