N-API support

[NickNaso]

Hi @lovell ,
I worked on this native addon and I ported it to N-API
You can find my work here: https://github.com/NickNaso/highwayhash/tree/napi
If you want experiment with N-API you can create a branch and call it "napi" so I can execute the PR on it.
After that we can iterate to over it and at the end publish a tagged version of highwayhash like reported here: https://nodejs.org/en/docs/guides/publishing-napi-modules/

[lovell]

Hello again, thanks for this Nick, like with your similar improvements for farmhash at lovell/farmhash#19 we can merge this when prebuild supports N-API too.

[lovell]

Hi @NickNaso, I'd be happy to accept and merge a PR for this if it's something you're still interested in.

[NickNaso]

Hi @lovell it could be great, but before to make a PR I want update and review my work. I will try to do tomorrow.

[lovell]

Brilliant, thank you, there's no time pressure.

[lovell]

v3.0.0 now available, thanks again for the PR.