chore(package): update ts-helpers to version 1.1.2

https://greenkeeper.io/

Author: neroniaky

package.json

@@ -65,7 +65,7 @@
     "karma-webpack": "1.8.0",
     "remap-istanbul": "^0.7.0",
 
-    "ts-helpers": "1.1.1",
+    "ts-helpers": "1.1.2",
     "ts-node": "1.4.2",
     "webpack": "^1.13.2"
   },