Update dependency es6-promise to v4

Author: renovate-bot

package.json

@@ -14,7 +14,7 @@
   "private": true,
   "dependencies": {
     "angular2": "2.0.0-beta.14",
-    "es6-promise": "^3.0.2",
+    "es6-promise": "^4.0.0",
     "es6-shim": "^0.35.0",
     "materialize-css": "^0.97.5",
     "reflect-metadata": "0.1.2",