A word in README on units returned would be appreciated

[dzek69]

Hey,
Thanks for this library, it seems a nice replacement for diskusage.

Looking at the code and output of df command I suspect that returned values are in bytes (rounded to nearest 1024 in Linux) - I'd be a nice to add this to README so people don't have to look in the code for this.

[iximiuz]

Hi @dzek69! Thanks, it sounds like a good idea indeed! You can always open a PR and adjust README to include this information, and I'll gladly merge it.