Remove the -z as an alias for the --zeroconf-port parameter

src/main.rs

@@ -101,7 +101,7 @@ fn setup(args: &[String]) -> Setup {
         .optopt("", "device", "Audio device to use. Use '?' to list options", "DEVICE")
         .optopt("", "mixer", "Mixer to use", "MIXER")
         .optopt("", "initial-volume", "Initial volume in %, once connected (must be from 0 to 100)", "VOLUME")
-        .optopt("z", "zeroconf-port", "The port the internal server advertised over zeroconf uses.", "ZEROCONF_PORT");
+        .optopt("", "zeroconf-port", "The port the internal server advertised over zeroconf uses.", "ZEROCONF_PORT");
 
     let matches = match opts.parse(&args[1..]) {
         Ok(m) => m,