[Rd] Suggestion: Make CRAN source URLs immutable

[Juan Telleria Ruiz de Aguirre]

It would be nice to see such immutable package version links:

E.g.:

https://cran.r-project.org/package=httr&version=1.3.1
https://cran.r-project.org/package=httr&version=1.3.0


In the CRAN package web pages themselves, and specifically in the "Old
Sources: httr Section":

https://cran.r-project.org/web/packages/httr/index.html

In order that package users become aware of it.

But just as actually is also perfectly fine!

Juan

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