Disable TLS connection, Return Error: starttls handshake: x509: certificate signed by unknown authority

[chandler1142]

I set notls=true, but I got error as title when I start the example.go.
The root cause is you set InsecureSkipVerify=false when enable tls, but not set InsecureSkipVerify=true when disable tls. Unfortunately, the InsecureSkipVerify default value is false.
To fix this just add a fragment in example.go:

if !*notls {
		xmpp.DefaultConfig = tls.Config{
			ServerName:         serverName(*server),
			InsecureSkipVerify: false,
		}
	} else {
		xmpp.DefaultConfig = tls.Config{
			ServerName: serverName(*server),
			InsecureSkipVerify:true,
		}
	}

[mattn]

Closed by #110