port 3483 udp

[henfri]

Hello,

thanks for your docker-image.

Please note, that port 3483 must also be bound udp to the host.
Otherwise, Clients will not be able to discover the server (but if they know the server already, everything will work fine; thust most of us will not notice).

Maybe, you can add that to the readme.md

Greetings,
Hendrik