Allow all UNIX systems to install the Pulseaudio/MPRIS features rathe…

…r than just Linux (see issue #152)

Cargo.toml

@@ -53,7 +53,7 @@ pulse = [ "pulsectl-rs", "libpulse-binding" ]
 mpris = [ "mpris-player" ]
 ffmpeg = []
 
-[target.'cfg(target_os = "linux")'.dependencies]
+[target.'cfg(unix)'.dependencies]
 pulsectl-rs = { version = "0.3.2", optional = true }
 libpulse-binding = { version = "2.24.0", optional = true }
 mpris-player = { version = "0.6.1", optional = true }