give attribution to previous work in nc package

[tdhock]

Hi! The new separate_wider_regex functions seems to be inspired by previous work in my namedCapture/nc packages, so I would suggest making it clear about where that idea comes from. At least in the academic/university, attribution is important so it would be useful for people to know/cite my related R Journal papers,
https://journal.r-project.org/archive/2019/RJ-2019-050/index.html
https://journal.r-project.org/archive/2021/RJ-2021-029/index.html

[hadley]

I have no recollection of ever seeing that package, but the chances are I did, and I just don't remember it. So we should certainly include a nod to this package in the news file and the docs.

[tdhock]

thanks!

[hadley]

I tweaked the language a bit since I think it's probably an example of convergent evolution, rather than a direct inspiration.