Bump express from 4.16.3 to 4.20.0 (#125)

Bumps [express](https://github.com/expressjs/express) from 4.16.3 to 4.20.0.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.16.3...4.20.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Samuel Urias <msamuelurias@gmail.com>

package.json

@@ -13,7 +13,7 @@
         "npm": ">=6.1.0"
     },
     "dependencies": {
-        "express": "4.16.3",
-        "serve-static": "1.16.0"
+        "express": "4.20.0",
+        "serve-static": "1.13.2"
     }
 }