Switch back to npm for now.

[nodech]

Because all handshake is using npm until we decide to switch everything to git (so tools can do proper dedups and etc), I believe it makes sense to release updates to npm and use npm for now.

• Update engine to 8.6.0 - See update engine.node to 8.6 for n-api. bcrypto#64

[nodech]

We could potentially wait for [email protected] to be published on npm.

[nodech]

Okay,

[email protected] is not published on npm (as mentioned in above comment) and also only adds bech32m support that is not necessary for hsd and those changes were modified and not tagged yet. (Build fails on windows)

So we should continue using [email protected] for bfilter/npm version and bump the major to 3.0.
Until bcrypto is sorted out. I doubt we will need to update bfilter/bcrypto for bcoin in near future, but in case we do we can just branch out from [email protected] and bump minor if it's a minor fix or something. (highly unlikely)

[pinheadmz]

Ok as discussed I think we should hold off on this kind of move until we're ready to make a big change to hsd like to GPK, maybe in the next release