Make diskusage Context Aware

[larssvensby]

We use diskusage in an Electron application and Electron is soon requiring Native Modules in the Renderer Process to be NAPI or Context Aware.

Is it possible to make diskusage Context Aware?
See electron/electron#18397 and an example https://github.com/atom/node-keytar/pull/182/files

Thanks

[jduncanator]

This looks relatively low cost, should be straightforward to add as well. I'll take a look at this over the next week, thanks!

[larssvensby]

Thanks!
I also saw this blagoev@d55db9d

[aleksey-hoffman]

@jduncanator hey mate, any progress on making this context aware on NAPI? What do you think about blagoev@d55db9d ?

[xiaoxiangmoe]

@aleksey-hoffman Good Job！