LinkKind: Bug issue URLs

[kallisti5]

One nice to have (and probably pretty easy one to catch) would be LinkKind::BugReference.
literally just /#[0-9]*/g (maybe with some boundaries to make sure it's not a middle of a string)

It would let users catch bug numbers and do things with them in strings.

kind of like: #1 :-)

but not:#1because

[jmairboeck]

Nitpick: that regex is probably just meant as pseudocode, but I would use + instead of * so that it matches at least one digit and not a # on its own.

[robinst]

Yeah maybe, if someone wants to raise a PR for it, happy to review.