Add mpv to default players

It's another fork of mplayer, more active than mplayer2.

weboob/tools/application/media_player.py

@@ -19,15 +19,15 @@
 
 
 import os
-from subprocess import Popen, PIPE
+from subprocess import PIPE, Popen
 
 from weboob.tools.log import getLogger
 
-
 __all__ = ['InvalidMediaPlayer', 'MediaPlayer', 'MediaPlayerNotFound']
 
 
 PLAYERS = (
+    ('mpv',      '-'),
     ('mplayer2', '-'),
     ('mplayer',  '-'),
     ('vlc',      '-'),