* Ignored errors getting `COMPASS` cookie as Google appears to have changed
something.
* Improved attachment bridging support.
* Drive and YouTube links will be bridged even when they're sent as
attachments (rather than text messages).
* Bridging big files uses less memory now
(only ~1-2x file size rather than 2-4x).
* Link preview metadata is now included in the Matrix events
(in a custom field).
* Disabled file logging in Docker image by default.
* If you want to enable it, set the `filename` in the file log handler to
a path that is writable, then add `"file"` back to `logging.root.handlers`.
* Formatted all code using [black](https://github.com/psf/black)
and [isort](https://github.com/PyCQA/isort).