Bump tslint from 5.16.0 to 5.18.0 (#162)

Bumps [tslint](https://github.com/palantir/tslint) from 5.16.0 to 5.18.0.
- [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/5.16.0...5.18.0)

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

package.json

@@ -91,7 +91,7 @@
     "source-map-support": "^0.5.9",
     "spectron": "^6.0.0",
     "ts-node": "^8.2.0",
-    "tslint": "^5.15.0",
+    "tslint": "^5.18.0",
     "tslint-config-airbnb": "^5.11.1",
     "tslint-react": "^4.0.0",
     "tslint-react-recommended": "^1.0.15",