Log Message:
py-xandikos: updated to 0.2.0

0.2.0:
* Fix <calendar-data> subelement filtering.
* Skip non-calendar files for calendar-query operations.
* Switch to using aiohttp rather than uWSGI.
* Query component's SUMMARY in ICalendarFile.describe().
* Add /metrics support.
* Drop support for Python 3.4, add support for 3.8.