- Don't require sequence arguments to `Folder.*_items()` methods to support `len()` (e.g. generators and `map` instances are now supported) - Allow empty sequences as argument to `Folder.*_items()` methods
1.3.4
-----
- Add support for `required_attendees`, `optional_attendees` and `resources` attribute on `folders.CalendarItem`. These are implemented with a new `folders.Attendee` class.
1.3.3
-----
- Add support for `organizer` attribute on `CalendarItem`. Implemented with a new `folders.Mailbox` class.