Simple mdns client

```rust use simplemdnsclient::MdnsClient;

fn main() -> Result<(), Box> {

let mdns = MdnsClient::new("libmdns Web Server._http._tcp.local")?;

loop {
    println!("{:#?}", mdns.get_services());
    std::thread::sleep(std::time::Duration::from_millis(2000));
}

} ```

Only testet to work with https://github.com/librespot-org/libmdns