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](https://github.com/palantir/tslint/compare/5.20.1...6.0.0)

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

package.json

@@ -44,7 +44,7 @@
         "replace-in-file-webpack-plugin": "^1.0.6",
         "tfx-cli": "^0.7.11",
         "ts-loader": "^6.2.1",
-        "tslint": "^5.20.1",
+        "tslint": "^6.0.0",
         "typescript": "^3.7.5",
         "webpack": "^4.41.5",
         "webpack-cli": "^3.3.10"