feature request: local usage

[tpapp]

It would be nice to be able to use some features of this package locally, on one's own computer, on demand.

Eg I could imagine something like

julia> import CompatHelper

julia> CompatHelper.show_possible_upgrades("~/code/to/my/repo")
# just list information, eg Foo could be upgraded 0.1.2 => 0.3
# do not modify files

julia> CompatHelper.propose_possible_upgrades("~/code/to/my/repo")
# when there are no uncommitted changes, modify files, otherwise abort

The user could then review and test these.

Looking at the sources, I think a lot of the building blocks for this are actually available.

[DilumAluthge]

Not a bad idea.

I won't have time to work on this, but if someone else wants to work on it and make a PR, I'd be happy to review the PR.

[tpapp]

https://gitlab.com/aplavin/compathelperlocal.jl deals with this effectively, so I would suggest that it is just mentioned in the README.md.