Use ::park() instead of ::sleep()

src/bin.rs

@@ -195,7 +195,7 @@ fn main() {
             println!("Server listening on port {}", port);
 
             loop {
-                thread::sleep(Duration::from_secs(1));
+                thread::park();
             }
         },
         ("pack", _) => {

src/vfs_watch.rs

@@ -93,7 +93,7 @@ impl VfsWatcher {
         }
 
         loop {
-            thread::sleep(Duration::from_secs(1));
+            thread::park();
         }
     }
 }