3.3.3

• #142: CANCEL and REPLY messages now include the DTSTART from the
  original event.
• #143: SCHEDULE-AGENT on the ORGANIZER property is respected.
• #144: PARTSTAT=NEEDS-ACTION is now set for new invites, if no PARTSTAT is
  set to support the inbox feature of iOS.
• #147: Bugs related to scheduling all-day events.
• #148: Ignore events that have attendees but no organizer.
• #149: Avoiding logging errors during timezone detection. This is a workaround
  for a PHP bug.
• Support for "Line Islands Standard Time" windows timezone.
• #154: Correctly work around vCard parameters that have a value but no name.