v2.3.1 (2016-02-14)

Bug fix release.

• Require Mopidy < 2 as Mopidy 2.0 breaks the audio API with the upgrade to
  GStreamer 1.

• Use the new Spotify Web API for search. Searching through libspotify has been
  discontinued and is not working anymore. (Fixes: #89)

• Note that search through the Spotify Web API doesn't return artists or date
  for albums. This also means that library.get_distinct() when given type
  albumartist or date and a query only returns an empty set.

• Emit a warning if config value spotify/search_album_count,
  spotify/search_artist_count, or spotify/search_track_count is greater
  than 50, and use 50 instead. 50 is the maximum value that the Spotify Web API
  allows. The maximum in the config schema is not changed to not break existing
  configs.