--features sound (#63)

to enable `sound` notification for local builds only. Needed to avoid
endless issues by building the app for different platforms. Sound
support can be hard.

src/main.rs

@@ -8,12 +8,14 @@ mod logging;
 
 mod args;
 mod duration;
-mod sound;
 mod storage;
 mod terminal;
 mod utils;
 mod widgets;
 
+#[cfg(feature = "sound")]
+mod sound;
+
 use app::{App, FromAppArgs};
 use args::Args;
 use clap::Parser;