Support URLs as entire "release notes" contents

[mgravell]

Release notes are a bit awkward in the app, and updating them in the package is usually a bad idea as it is hard (impossible) to fix the release notes. Additionally, in the csproj or nuspec is a horrible place to try to store cumulative notes. And the formatting is poor.

As such, a lot of people just use a URL. There exists #2280 to improve the formatting (which would allow this indirectly, by using [see here](https://some.com/url) as the notes), but as a really quick win that doesn't get bogged down in lots of questions like "which variant of markdown?", pragmatic option:

If the release notes are a http[s] URL and just a http[s] URL: linkify it in the gallery.

I would be happy to submit a PR if it helps (thought it best to discuss first).

[Drawaes]

I use a csproj include based on the version number I tag it in during the build...
https://github.com/Drawaes/CondenserDotNet/tree/master/releasenotes
Granted I don't have a lot in them at the moment but I could.

If you look at my appveyor build it checks if there was a release tag that triggered the build and if so changes the include.

[NickCraver]

Related: see NuGet/Home#1734 which was merged into NuGet/Home#1203

I think making it recognize and auto-link URLs seems like a very cheap Gallery-only win though. Perfection shouldn't be the blocker to incremental, easy, substantial improvements here.

[Drawaes]

I tend to agree, what is the goal here though? To scrap the data from the URL and pull it into nuget? If so that leads to a load of potential problems. Why not make it MD ?

[NickCraver]

Nope - literally to make it clickable, that's it. I think it should be makrdown, etc., but a very easy win would be to just make it a link.

[Drawaes]

In that case, I withdraw my comments and it give it a thumbs up

[skofman1]

Thanks for the feedback @mgravell , @NickCraver , @Drawaes . We are currently working on improvments in this area and will take your feedback into account.

//cc @chenriksson , @jonwchu

[skofman1]

@mgravell , our preview site includes the change you requested:
#4492
#4505

Feel free to reopen this issue if the added feature doesn't cover your ask.