async function enableCalendar(selector) {
  const calendar = await this.gladys.calendar.update(selector, {
    sync: true,
  });

  logger.info(`Calendar ${selector} enabled`);
  return calendar;
}
@description Enable calendar synchronization.
@param {string} selector - Calendar selector to update.
@returns {Promise<object>} Resolve with updated calendar.
@example
enableCalendar('personnal')