chrono-human-duration

Very small crate for format durations for humans.

Example

```rust use chronohumanduration::ChronoHumanDuration; use chrono::Duration;

let d = Duration::weeks(2) + Duration::days(3); asserteq!(d.formathuman().tostring(), "2 weeks ago"); let d = Duration::minutes(20); asserteq!(d.formathuman().tostring(), "just now"); ```