banChatMember(chatId, userId, form = {}) {
    form.chat_id = chatId;
    form.user_id = userId;
    return this._request('banChatMember', { form });
  }
Use this method to ban a user in a group, a supergroup or a channel.
In the case of supergroups and channels, the user will not be able to
return to the chat on their own using invite links, etc., unless unbanned first..

The **bot must be an administrator in the group, supergroup or a channel** for this to work.


@param {Number|String} chatId   Unique identifier for the target chat or username of the target channel (in the format `@channelusername`)
@param {Number} userId  Unique identifier of the target user
@param {Object} [options] Additional Telegram query options
@return {Promise} True on success.
@see https://core.telegram.org/bots/api#banchatmember