Remove reference to Pi MusicBox

doc/player_setup.md

@@ -1,7 +1,7 @@
 # Setup of audio players/server
 
 Snapcast can be used with a number of different audio players and servers, and so it can be integrated into your favorite audio-player solution and make it synced-multiroom capable.
-The only requirement is that the player's audio can be redirected into the Snapserver's fifo `/tmp/snapfifo`. In the following configuration hints for [MPD](http://www.musicpd.org/) and [Mopidy](https://www.mopidy.com/) are given, which are the base of other audio player solutions, like [Volumio](https://volumio.org/) or [RuneAudio](http://www.runeaudio.com/) (both MPD) or [Pi MusicBox](http://www.pimusicbox.com/) (Mopidy).
+The only requirement is that the player's audio can be redirected into the Snapserver's fifo `/tmp/snapfifo`. In the following configuration hints for [MPD](http://www.musicpd.org/) and [Mopidy](https://www.mopidy.com/) are given, which are the base of other audio player solutions, like [Volumio](https://volumio.org/) or [RuneAudio](http://www.runeaudio.com/) (both MPD).
 
 The goal is to build the following chain: