logging

src/main.rs

@@ -17,6 +17,11 @@ enum Mode {
 }
 
 fn main() {
+    tracing_subscriber::fmt()
+        .with_writer(std::io::stderr)
+        .with_env_filter("warn,jong=trace")
+        .init();
+
     let args = Args::parse();
 
     let mut app = App::new();