chore(deps): update dependency tslint to v5.9.1

Author: renovate-bot

package-lock.json

@@ -47,7 +47,7 @@
     "nyc": "11.4.1",
     "rimraf": "2.6.2",
     "source-map-support": "0.5.0",
-    "tslint": "5.8.0",
+    "tslint": "5.9.1",
     "typescript": "2.6.2"
   },
   "publishConfig": {