Bump tslint from 5.17.0 to 6.1.3 (#264)

Bumps [tslint](https://github.com/palantir/tslint) from 5.17.0 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@5.17.0...6.1.3)

Signed-off-by: dependabot-preview[bot] <[email protected]>

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

Author: dependabot-preview[bot]

package-lock.json

@@ -63,7 +63,7 @@
     "jest": "^24.9.0",
     "node-sass": "^4.14.1",
     "prettier": "^1.18.2",
-    "tslint": "^5.17.0",
+    "tslint": "^6.1.3",
     "tslint-config-prettier": "^1.18.0",
     "typescript": "^3.5.2"
   },