new command `r2g compare`

[ORESoftware]

the command r2g compare will compare the latest published version on npm with the git index.

see:
https://stackoverflow.com/questions/57400715/compare-npm-pack-tarball-with-whats-on-npm

it will open some editor that can diff all the files, probably some web-based tool

[ORESoftware]

might also be nice to compare what's in the folder, not just the git index

r2g compare # compared against what's in .npmignore
r2g compare --git-index
r2g compare --all