Review version terminology when node publish new standard grammar

[shadowspawn]

Node package maintenance group have been working on tidying up the grammar used to refer to node versions. Review the support in n for node versions when the new grammar is publicised.

nodejs/package-maintenance#236

One change to be more consistent might be to list all the matching versions for lts and latest when used with ls-remote, as currently these just show the newest version. Other targets like v10 and dubnium do list matches.

Old:

$ n ls-remote lts
12.13.0

As a convenience could add -1 like --all to just list one (newest) match from ls-remote.

[shadowspawn]

References:

• https://github.com/nodejs/package-maintenance/blob/master/docs/drafts/PACKAGE-SUPPORT.md#support-target
• https://github.com/pkgjs/nv#supported-aliases

[shadowspawn]

I don't see any new terminology to immediately adopt.

As for ls-remote correctness... current is probably correct just listing latest version with ls-remote. Technically, lts should probably list the latest version of each major line rather than just the newest one, but low benefit.