chore(package): update typings to version 2.0.0

https://greenkeeper.io/

package.json

@@ -80,6 +80,6 @@
     "tslint": "4.0.1",
     "typedoc": "^0.4.4",
     "typescript": "^1.8.10",
-    "typings": "^1.3.1"
+    "typings": "^2.0.0"
   }
 }