getFileLink(fileId, form = {}) {
    return this.getFile(fileId, form)
      .then(resp => `${this.options.baseApiUrl}/file/bot${this.token}/${resp.file_path}`);
  }
Get link for file.
Use this method to get link for file for subsequent use.
Attention: link will be valid for 1 hour.

This method is a sugar extension of the (getFile)[#getfilefileid] method,
which returns just path to file on remote server (you will have to manually build full uri after that).

@param {String} fileId  File identifier to get info about
@param {Object} [options] Additional Telegram query options
@return {Promise} Promise which will have  *fileURI* in resolve callback
@see https://core.telegram.org/bots/api#getfile