Beets-alternatives

* Running `beet completion` does not crash anymore [38][]

[38]: https://github.com/geigerzaehler/beets-alternatives/issues/38

* Symlink views now support relative symlinks (daviddavo)
* Running just `beet alt` does not throw an error anymore (daviddavo)

* The package is now on PyPI
* Require at least beets v1.4.7
* Update album art in alternatives when it changes
* Python 3 support (Python 2.7 continuous to be supported)
* Support the format aliases defined by the convert plugin ('wma' and 'vorbis'
with current beets)
* Bugfix: Explicitly write tags after encoding instead of relying on the
encoder to do so
* Bugfix: If the `formats` config option is modified, don't move files if the
extension would change, but re-encode

* Fix a bug that made the plugin crash when reading unicode strings
from the configuration

* Require beets v1.3.13 and drop support for all older versions.
* Embed cover art when converting items

First proper release