chore(package): update typescript to version 2.1.6 (PatrickJS#1504)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -143,7 +143,7 @@
     "tslint": "~4.4.2",
     "tslint-loader": "^3.3.0",
     "typedoc": "^0.5.3",
-    "typescript": "~2.1.5",
+    "typescript": "~2.1.6",
     "url-loader": "^0.5.7",
     "webpack": "2.2.0",
     "webpack-dev-middleware": "^1.10.0",