#62 crash on upd broadcast

[Error]

Hi,
just wanted to let you know that running this:
nc -u 255.255.255.255 1337

leads to an error:
nc: netcat.c:573: main: Assertion `connect_sock.proto != NETCAT_PROTO_UDP' failed.
Aborted (core dumped)

i know there is already a report for this.
would you merge a patch that fixes this?