Bump tslint from 5.20.0 to 5.20.1

Bumps [tslint](https://github.com/palantir/tslint) from 5.20.0 to 5.20.1.
- [Release notes](https://github.com/palantir/tslint/releases)
- [Changelog](https://github.com/palantir/tslint/blob/master/CHANGELOG.md)
- [Commits](palantir/tslint@5.20.0...5.20.1)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -56,7 +56,7 @@
     "supertest": "^4.0.2",
     "ts-jest": "^24.1.0",
     "ts-node-dev": "^1.0.0-pre.43",
-    "tslint": "^5.15.0",
+    "tslint": "^5.20.1",
     "tslint-config-prettier": "~1.18.0",
     "tslint-eslint-rules": "^5.4.0"
   },