remove print

src/lib.rs

@@ -191,7 +191,6 @@ pub fn bench_multiple(b: &Bencher, benches: Vec<(String, Box<dyn Fn() -> Duratio
                 "could not create parent directory of log file '{}'",
                 path.to_str().unwrap()
             ));
-            println!("append: {}", append);
             let mut f = File::options()
                 .write(true)
                 .append(append)