chore(deps): update dependency tslint to v6

Author: renovate-bot

package-lock.json

@@ -88,7 +88,7 @@
     "sinon": "^6.0.0",
     "source-map-support": "^0.5.0",
     "temp": "^0.8.3",
-    "tslint": "^5.20.0",
+    "tslint": "^6.1.0",
     "tslint-language-service": "^0.9.9"
   },
   "bin": {