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

Author: renovate-bot

package-lock.json

@@ -60,7 +60,7 @@
     "prettier-standard": "9.1.1",
     "semantic-release": "15.13.30",
     "tsd-jsdoc": "2.4.0",
-    "tslint": "5.20.0",
+    "tslint": "5.20.1",
     "tslint-config-prettier": "1.18.0",
     "tslint-config-standard": "8.0.1",
     "typescript": "3.7.2"