Update dependency tslint to v6.1.2

Author: renovate-bot

package-lock.json

@@ -48,7 +48,7 @@
     "rollup-plugin-typescript": "1.0.1",
     "should": "13.2.3",
     "ts-node": "8.9.1",
-    "tslint": "6.1.1",
+    "tslint": "6.1.2",
     "tslint-config-prettier": "1.18.0",
     "typedoc": "0.17.4",
     "typescript": "3.8.3",