REQUIRES https://build.opensuse.org/request/show/1043982

- Update to 0.19.0:
- Add "shell" password fetch strategy to pass command string to
a shell.
- Add "description" and "order" as metadata.
These fetch the CalDAV: calendar-description,
``CardDAV:addressbook-description`` and
``apple-ns:calendar-order`` properties respectively.
- Add a new ``showconfig`` status. This prints *some*
configuration values as JSON. This is intended to be used by
external tools and helpers that interact with ``vdirsyncer``,
and considered experimental.
- Update TLS-related tests that were failing due to weak MDs.
- ``pytest-httpserver`` and ``trustme`` are now required for
tests.
- ``pytest-localserver`` is no longer required for tests.
- Multithreaded support has been dropped. The
``"--max-workers`` has been removed.
- A new ``asyncio`` backend is now used. So far, this shows
substantial speed improvements in ``discovery`` and
``metasync``, but little change in `sync`. This will likely
continue improving over time. :gh:`906`
- The ``google`` storage types no longer
require ``requests-oauthlib``, but require
``python-aiohttp-oauthlib`` instead.
- Vdirsyncer no longer includes experimental support for
`EteSync `_. The existing
integration had not been supported for a long time and
no longer worked. Support for external storages may be
added if anyone is interested in maintaining an EteSync
plugin. EteSync users should consider using `etesync-dav`_.
- The ``plist`` for macOS has been dropped. It was broken and
homebrew generates their own based on package metadata. macOS
users are encouraged to use that as a reference.
- Changes to SSL configuration:
- Support for ``md5`` and ``sha1`` certificate fingerprints
has been dropped. If you're validating certificate
fingerprints, use ``sha256`` instead.
- When using a custom ``verify_fingerprint``, CA validation
is always disabled.
- If ``verify_fingerprint`` is unset, CA verification is
always active. Disabling both features is insecure and no
longer supported.
- The ``verify`` parameter no longer takes boolean values, it
is now optional and only takes a string to a custom CA for
verification.
- The ``verify`` and ``verify_fingerprint`` will likely be
merged into a single parameter in future.