code: func (bot *BotAPI) UnbanChatMember(config ChatMemberConfig) (APIResponse, error) {
  	v := url.Values{}
  
  	if config.SuperGroupUsername != "" {
  		v.Add("chat_id", config.SuperGroupUsername)
  	} else if config.ChannelUsername != "" {
  		v.Add("chat_id", config.ChannelUsername)
  	} else {
  		v.Add("chat_id", strconv.FormatInt(config.ChatID, 10))
  	}
  	v.Add("user_id", strconv.Itoa(config.UserID))
  
  	bot.debugLog("unbanChatMember", v, nil)
  
  	return bot.MakeRequest("unbanChatMember", v)
  }
docs: // UnbanChatMember unbans a user from a chat. Note that this only will work
  // in supergroups and channels, and requires the bot to be an admin.