allow multiple addresses in ServiceInfo about mdns-sd

[keepsimple1]

Since host_ipv4 is &str in ServiceInfo::new, we could add support specifying one or more ipv4 addresses in the same string, separated by , or some other separator. What do you think? (any other suggestions are welcome).

[indietyp]

Going with a string separated by , would be a good idea, but also adding methods like insert_address and remove_address for a more programmatic approach.

One could also imagine having an optional dependency on the ipnet crate, which provides access to an Ipv4AddrRange and Ipv4Net struct.

I'd be happy to create a pull request that implements those changes.

[keepsimple1]

Adding methods like insert_address and remove_address sounds good to me. I'm reluctant to add a new dependency for this purpose, unless something really useful.

Thank you for submitting the PR. Will take a look.

[indietyp]

#21 was merged, closing this issue