sendContact(chatId, phoneNumber, firstName, form = {}) {
    form.chat_id = chatId;
    form.phone_number = phoneNumber;
    form.first_name = firstName;
    return this._request('sendContact', { form });
  }
Send contact.
Use this method to send phone contacts.

@param {Number|String} chatId  Unique identifier for the target chat or username of the target channel (in the format `@channelusername`)
@param {String} phoneNumber Contact's phone number
@param {String} firstName Contact's first name
@param {Object} [options] Additional Telegram query options
@return {Promise} On success, the sent [Message](https://core.telegram.org/bots/api#message) object is returned
@see https://core.telegram.org/bots/api#sendcontact