bug: fluent can't return `429` and other some other HTTP error codes

[ClemDoum]

Steps to reproduce:

WebServer().configure(routes -> routes.get("/", new Payload(429))).start(8080);

When curling http://localhost:8080, the status code will be 200.

This is because SimpleResponse.setStatus uses Status.getStatus(statusCode) from SimpleHttpFramework under the hood and the returns 200 when the statusCode is not in the Status enum.

429 is missing from this enum.