chore(package): update tsutils to version 2.16.0

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "ts-jest": "^21.1.4",
     "tslint": "^5.8.0",
     "tslint-config-airbnb": "^5.3.0",
-    "tsutils": "^2.12.2",
+    "tsutils": "^2.16.0",
     "typedoc": "^0.9.0",
     "typescript": "^2.6.1"
   },