Bump tslint from 5.18.0 to 5.19.0

Bumps [tslint](https://github.com/palantir/tslint) from 5.18.0 to 5.19.0.
- [Release notes](https://github.com/palantir/tslint/releases)
- [Changelog](https://github.com/palantir/tslint/blob/master/CHANGELOG.md)
- [Commits](palantir/tslint@5.18.0...5.19.0)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -75,7 +75,7 @@
     "pretty-quick": "^1.11.1",
     "protractor": "^5.4.2",
     "ts-node": "~8.3.0",
-    "tslint": "~5.18.0",
+    "tslint": "~5.19.0",
     "typescript": "^3.2.2"
   }
 }