message: microseconds -> nanoseconds
diff: @@ -131,7 +131,7 @@ fn main() -> std::io::Result<()> {
  end, frequency, mbps
  );
  - println!("publish latency breakdown in microseconds:");
  + println!("publish latency breakdown in nanoseconds:");
  println!(" min: {:10.0} ns", HISTOGRAM.percentile(0.0));
  for pctl in &[50., 75., 90., 95., 97.5, 99.0, 99.99, 99.999] {
  println!(
  