Log Message:
audio/spotify-player: update to 0.12.1

What's Changed
 - Support customizable formats in #147
 - Fixed duplicate keys on Windows in #151
 - Add more UI customizations and refactor UI codes in #152

What's new
 - New config options: playback_format, notify_format, border_type,
   progress_bar_type
 - New theme's component style: playback_artists