Triggered after LemonStand update request is issued.
The event handler accepts the server response array. In the event handler you can throw an exception in order to cancel the request.
Usage example:
public function subscribeEvents()
{
Backend::$events->addEvent('core:onAfterSoftwareUpdateRequest', $this, 'after_software_update_request');
}
public function after_software_update_request($response)
{
throw new Phpr_ApplicationException("We're sorry, you cannot update this store.");
}