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

Author: renovate-bot

package-lock.json

@@ -44,7 +44,7 @@
     "pre-commit": "1.2.2",
     "ts-jest": "24.2.0",
     "ts-node": "8.5.4",
-    "tslint": "5.16.0",
+    "tslint": "5.20.1",
     "typescript": "3.4.5"
   },
   "engines": {