code: func (c *Client) Whisper(username, text string) {
  	c.send(fmt.Sprintf("PRIVMSG #%s :/w %s %s", c.ircUser, username, text))
  }
docs: // Whisper write something in private to someone on twitch
  // whispers are heavily spam protected
  // so your message might get blocked because of this
  // verify your bot to prevent this