Bump tslint from 5.20.1 to 6.1.3

Bumps [tslint](https://github.com/palantir/tslint) from 5.20.1 to 6.1.3.
- [Release notes](https://github.com/palantir/tslint/releases)
- [Changelog](https://github.com/palantir/tslint/blob/master/CHANGELOG.md)
- [Commits](palantir/tslint@5.20.1...6.1.3)

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

package.json

@@ -43,7 +43,7 @@
     "lint-staged": "^9.1.0",
     "prettier": "^1.18.2",
     "ts-jest": "^24.0.2",
-    "tslint": "^5.18.0",
+    "tslint": "^6.1.3",
     "tslint-config-prettier": "^1.18.0",
     "typescript": "^3.5.2"
   },