py-beets: updated to 1.4.7

1.4.7:

This new release includes lots of new features in the importer and the
metadata source backends that it uses.
We've changed how the beets importer handles non-audio tracks listed in
metadata sources like MusicBrainz:

* The importer now ignores non-audio tracks (namely, data and video tracks)
  listed in MusicBrainz. Also, a new option, :ref:ignore_video_tracks, lets
  you return to the old behavior and include these video tracks.
* A new importer option, :ref:ignored_media, can let you skip certain media
  formats.

There are other subtle improvements to metadata handling in the importer:
* In the MusicBrainz backend, beets now imports the
  musicbrainz_releasetrackid field. This is a first step toward
* A new importer configuration option, :ref:artist_credit, will tell beets
  to prefer the artist credit over the artist when autotagging.

And there are even more new features:
* :doc:/plugins/replaygain: The beet replaygain command now has
  --force, --write and --nowrite options.
* A new importer configuration option, :ref:incremental_skip_later, lets you
  avoid recording skipped directories to the list of "processed" directories
  in :ref:incremental mode. This way, you can revisit them later with
  another import.
* :doc:/plugins/fetchart: The configuration options now support
  finer-grained control via the sources option. You can now specify the
  search order for different *matching strategies* within different backends.
* :doc:/plugins/web: A new cors_supports_credentials configuration
  option lets in-browser clients communicate with the server even when it is
  protected by an authorization mechanism (a proxy with HTTP authentication
  enabled, for example).
* A new :doc:/plugins/sonosupdate plugin automatically notifies Sonos
  controllers to update the music library when the beets library changes.
* :doc:/plugins/discogs: The plugin now stores master release IDs into
  mb_releasegroupid. It also "simulates" track IDs using the release ID
  and the track list position.
* :doc:/plugins/discogs: Fetch the original year from master releases.

There are lots and lots of fixes


(adam)