Benchmark npm 6

[Brandon Murry]

https://blog.npmjs.org/post/173260195980/announcing-npm6

[Zoltan Kochan]

I tried it last week but it failed on one of the benchmarks. I'll retry it later. It shouldn't be faster than v5 though

[Brandon Murry]

Good point about v5, I think their claim of "npm@6 is up to 17x faster than the npm of one year ago." is also including npm@5 in that statement.

[Zoltan Kochan]

This is done. npm@6 is used in the benchmarks