feat: add orderby-bpm argument

feat: add bpm and max-bpm argument

feat: add other-playlists argument; rewrite documentation

feat: add descending argument

feat: add filter argument, refs #20

feat: add Playlist and PlaylistEntry objects

feat: add add-info argument, refs #19

feat: add unix argument

chore: add new minor release

feat: add max-size and max-length arguments