build(deps-dev): Bump tslint from 5.20.1 to 6.0.0

Bumps [tslint](https://github.com/palantir/tslint) from 5.20.1 to 6.0.0.
- [Release notes](https://github.com/palantir/tslint/releases)
- [Changelog](https://github.com/palantir/tslint/blob/master/CHANGELOG.md)
- [Commits](palantir/tslint@5.20.1...6.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -49,7 +49,7 @@
     "nyc": "^15.0.0",
     "source-map-support": "^0.5.12",
     "ts-node": "^8.1.0",
-    "tslint": "^5.16.0",
+    "tslint": "^6.0.0",
     "typescript": "^3.4.4"
   },
   "config": {