Conversions from milliseconds are rounded

```
ms("2.5 hrs") // 9000000
ms("9000000") // 3h
ms("9000000", { long: true ) // 3 hours
```

The above code returns `"3h"` or `"3 hours"` when a total of `2.5 hrs` in milliseconds is parsed.

If there are technical limitations to returning accurate string representations, it would be ideal to provide an example and explanation in the repository **readme.md**.

