add a log output on startup so it doesnt look like it's stuck when debug log is disabled and there's no players running

src/main.rs

@@ -143,6 +143,8 @@ fn main() -> Result<(), Error> {
 
     let mut artist_cache = HashMap::<String, bool>::new();
 
+    info!("Waiting for players...");
+
     'main_loop:
     loop {
         // XXX this picks the first player, which isn't always ideal - see mpris/src/find.rs