- update to 0.13.0:
* `b4 am` now has a `--single-message` flag that lets you process a
single message and ignore any other parts of a thread; this is
useful when there is a patch series sent as attachments to a single
message
* `--apply-cover-trailers` is now the default behaviour
* when patchwork integration is configured, `b4 am` will attempt to
retrieve the CI status of patches
* `b4 prep --show-info` can do a lot more now, including showing
information about branches that aren't currently checked out
* `b4 prep` gained a --cleanup option to properly archive and remove
old b4*prep-managed branches
* `b4 send` has a `--preview-to` option that lets you send a
pre*review of your series to your colleagues, mentors, or bosses
* various fixes and improvements to `b4 send` functionality
* b4 can now take config options on commandline, allowing to override
global configs via scripted invocations
* improvements to `b4 diff` that should make it work more reliably for
series without exact object matches