code: func (b *Bot) Unban(chat *Chat, user *User) error {
  	params := map[string]string{
  		"chat_id": chat.Recipient(),
  		"user_id": user.Recipient(),
  	}
  
  	respJSON, err := b.Raw("unbanChatMember", params)
  	if err != nil {
  		return err
  	}
  
  	return extractOkResponse(respJSON)
  }
docs: // Unban will unban user from chat, who would have thought eh?