Bump tslint from 5.19.0 to 5.20.0 in /js

Bumps [tslint](https://github.com/palantir/tslint) from 5.19.0 to 5.20.0.
- [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/5.19.0...5.20.0)

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

js/package.json

@@ -58,7 +58,7 @@
     "graphql-cli": "^3.0.12",
     "node-sass": "^4.11.0",
     "sass-loader": "^8.0.0",
-    "tslint": "^5.16.0",
+    "tslint": "^5.20.0",
     "tslint-config-airbnb": "^5.11.1",
     "typescript": "^3.4.3",
     "vue-cli-plugin-webpack-bundle-analyzer": "^1.3.0",