Support wildcard(s) in --label / -L string.

[phrohdoh]

This would make generalized filtering much more intuitive.

For example: ghi list --label "OS:*"

Or an explicit: ghi list --label "OS:*" --regex|expand|<better name>

[AlexChesters]

This is a great idea. I like the simplicity of the first example, the concept of a wildcard is well understood so it seems fine.

If you (or anyone else) feels like submitting a PR, even better!

[krux02]

Well, I think labels should be composable with and/or commands. Something like, git list --label --or OS:{windows,linux,osx}. (expansion of {} is a shell feature, no support needed)