Data Race when calling Server.SetText() from another goroutine.

[AhmadMuzakkir]

The Go Data Race Detector detects a data race.
More specifically, the data race is in Server.composeBrowsingAnswers().

	txt := &dns.TXT{
		Hdr: dns.RR_Header{
			Name:   s.service.ServiceInstanceName(),
			Rrtype: dns.TypeTXT,
			Class:  dns.ClassINET,
			Ttl:    s.ttl,
		},
		Txt: s.service.Text, // Data race here
	}

I think this is because the Server runs on it's own goroutine.
So when you modify the Service field from another goroutine, a data race will occur.