You mean announcing the server version number in chat when someone joins? Right now the server version number is already placed in the code. When running the server it will tell you which version you are using.
I don't think putting it in the config file is such a good idea because people might upgrade their server without upgrading their config file but perhaps announcing it in chat when a player joins is a good idea.
Yeah sorry Andrew I meant add a option in config to turn it off or on

Though it's not also a bad idea if there is a new config option that it tells you on startup that the config file has changed

But yeah I meant show it in game when you login but let it be disabled if they want via config (like a production server)