Merge pull request #182 from neroniaky/greenkeeper-zone.js-0.8.4

Update zone.js to version 0.8.4 🚀

Author: neroniaky

package.json

@@ -60,7 +60,7 @@
     "ts-node": "2.1.0",
     "typescript": "2.2.1",
     "webpack": "2.2.1",
-    "zone.js": "0.8.0"
+    "zone.js": "0.8.4"
   },
   "author": "Jan-Philipp Riethmacher <neroniaky@gmail.com>",
   "license": "MIT",