chore(deps): update dependency tslint to v5.20.1

Author: renovate-bot

package-lock.json

@@ -47,7 +47,7 @@
     "nyc": "11.9.0",
     "rimraf": "2.7.1",
     "source-map-support": "0.5.19",
-    "tslint": "5.19.0",
+    "tslint": "5.20.1",
     "typescript": "3.9.9"
   },
   "publishConfig": {