Bugfix for Cronjob plugin

It has come to our attention that the Cronjob-Plugin (serendipity_event_cronjob) has a bug that prevents it from properly detecting the next scheduled update time. This bug has been fixed in version 0.6, which should now be available through Spartacus and usual means.

If you use this plugin, this is a required update to ensure it's proper function. Thanks to Matthias2 from the forums for reporting this to us.