Bump tslint from 5.12.1 to 5.19.0

Bumps [tslint](https://github.com/palantir/tslint) from 5.12.1 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@5.12.1...5.19.0)

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

package.json

@@ -84,7 +84,7 @@
         "request": "^2.88.0",
         "sinon": "^7.2.4",
         "sinon-chai": "^3.3.0",
-        "tslint": "^5.12.1",
+        "tslint": "^5.19.0",
         "typescript": "^3.2.4",
         "vscode": "^1.1.33"
     },