Btrfs: update the MAINTAINERS file

Josef and I have new email addresses
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>

MAINTAINERS

@@ -1921,7 +1921,8 @@ S:	Maintained
 F:	drivers/gpio/gpio-bt8xx.c
 
 BTRFS FILE SYSTEM
-M:	Chris Mason <chris.mason@fusionio.com>
+M:	Chris Mason <clm@fb.com>
+M:	Josef Bacik <jbacik@fb.com>
 L:	linux-btrfs@vger.kernel.org
 W:	http://btrfs.wiki.kernel.org/
 Q:	http://patchwork.kernel.org/project/linux-btrfs/list/