si-scale 0.1.0
Formats value using the appropriate SI scale.
```
use si_scale::helpers::{seconds, seconds3};
let actual = format!("{}", seconds(1.3e-5));
let expected = "13 µs";
assert_eq!(actual, expected);
let actual = format!("{}", seconds3(1.3e-5));
let expected = "13.000 µs";
assert_eq!(actual, expected);
```