Log Message:
Updated py-vdirsyncer to 0.16.0.

Version 0.16.0
==============

*released on 2 June 2017*

- Strip ``METHOD:PUBLISH`` added by some calendar providers, see :gh:`502`.
- Fix crash of Google storages when saving token file.
- Make DAV discovery more RFC-conformant, see :ghpr:`585`.
- Vdirsyncer is now tested against Xandikos, see :ghpr:`601`.
- Subfolders with a leading dot are now ignored during discover for
  ``filesystem`` storage. This makes it easier to combine it with version
  control.
- Statuses are now stored in a sqlite database. Old data is automatically
  migrated. Users with really large datasets should encounter performance
  improvements. This means that **sqlite3 is now a dependency of vdirsyncer**.
- **Vdirsyncer is now licensed under the 3-clause BSD license**, see :gh:`610`.
- Vdirsyncer now includes experimental support for `EteSync
  <https://www.etesync.com/>`_, see :ghpr:`614`.
- Vdirsyncer now uses more filesystem metadata for determining whether an item
  changed. You will notice a **possibly heavy CPU/IO spike on the first sync
  after upgrading**.
- **Packagers:** Reference ``systemd.service`` and ``systemd.timer`` unit files
  are provided. It is recommended to install these as documentation if your
  distribution is systemd-based.