chore(deps-dev): bump tslint from 5.20.1 to 6.1.0 (#8)

Bumps [tslint](https://github.com/palantir/tslint) from 5.20.1 to 6.1.0.
- [Release notes](https://github.com/palantir/tslint/releases)
- [Changelog](https://github.com/palantir/tslint/blob/master/CHANGELOG.md)
- [Commits](palantir/tslint@5.20.1...6.1.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -67,7 +67,7 @@
     "prettier": "^1.19.1",
     "ts-jest": "^24.2.0",
     "ts-node": "^8.5.4",
-    "tslint": "^5.20.1",
+    "tslint": "^6.1.0",
     "tslint-config-prettier": "^1.18.0",
     "typescript": "^3.7.2",
     "yarn-or-npm": "^3.0.1"