code: func (conn *Conn) ConnectTo(host string, pass ...string) error {
  	conn.cfg.Server = host
  	if len(pass) > 0 {
  		conn.cfg.Pass = pass[0]
  	}
  	return conn.Connect()
  }
docs: // ConnectTo connects the IRC client to "host[:port]", which should be either
  // a hostname or an IP address, with an optional port. It sets the client's
  // Config.Server to host, Config.Pass to pass if one is provided, and then
  // calls Connect.