Update links to quelpa and quelpa-use-package

[paulwicking]

Quelpa moved back to github a while ago, as did quelpa-use-package. The minimum version requirement for the latter changed since the move. Update the links to reflect the changes.

[alphapapa]

Thanks. Unfortunately that's practically a standard section in my projects' readmes, so those links will need to be updated in many places...eventually... :)

[paulwicking]

If you'd like, I can apply the patch across repos and push them. You'd still need to review them all, though :)

[alphapapa]

If you'd like, I can apply the patch across repos and push them. You'd still need to review them all, though :)

I couldn't ask you to do that, as they're my responsibility. But if you happen to have the time (or an automation) and want to, I won't object! (I also don't promise to merge them anytime soon, as my time for FOSS projects is very limited right now.)