Bump express from 4.15.4 to 4.19.2 in /hello-world

Bumps [express](https://github.com/expressjs/express) from 4.15.4 to 4.19.2.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.15.4...4.19.2)

---
updated-dependencies:
- dependency-name: express
  dependency-type: direct:development
...

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Author: dependabot[bot]

hello-world/package.json

@@ -46,7 +46,7 @@
     "eslint-plugin-promise": "3.5.0",
     "eslint-plugin-standard": "3.0.1",
     "eventsource-polyfill": "0.9.6",
-    "express": "4.15.4",
+    "express": "4.19.2",
     "extract-text-webpack-plugin": "3.0.0",
     "file-loader": "0.11.2",
     "friendly-errors-webpack-plugin": "1.6.1",