chore(deps-dev): bump tslint from 5.14.0 to 5.15.0

Bumps [tslint](https://github.com/palantir/tslint) from 5.14.0 to 5.15.0.
- [Release notes](https://github.com/palantir/tslint/releases)
- [Changelog](https://github.com/palantir/tslint/blob/master/CHANGELOG.md)
- [Commits](palantir/tslint@5.14.0...5.15.0)

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

Author: dependabot-support

package-lock.json

@@ -85,7 +85,7 @@
     "semantic-release": "15.13.3",
     "supertest": "4.0.2",
     "travis-deploy-once": "5.0.11",
-    "tslint": "5.14.0",
+    "tslint": "5.15.0",
     "typedoc": "0.14.2",
     "typescript": "3.4.1"
   },