Unlikely to Support UDP Port Scan about gomap

[JustinTimperio]

You are probably right with the UDP support. I honestly added it as a throwaway feature since:

1. TCP scanning was the real priority when I wrote this
2. The dial conn, err = net.Dial("udp", raddr) allows for calls other than TCP so I figured I would just expose it to the user to decide.

[cogitoergosumsw]

I think to successfully do a UDP port scan, you may need a list of pre-determined list of services to probe for responses.
First construct a UDP packet request with a byte array that is expected from the service running on the UDP port. Then listen for the corresponding response byte array to check if the port is open. Something like this - https://github.com/antelman107/net-wait-go#udp-library-usage-example

I understand this is a lot of work so I'm just putting this out there for reference. I don't think I can do this on my own :D