[racket] "do what i mean" for https://github links

It took me a while of reading through the docs to figure out why trying to
install a package via "https://github.com/user/pkg" failed for want of a
MANIFEST file. I think the "do what I mean" installer should have
autoconverted it to git:// , seeing as how github is already special-cased.

(Also my first try of installing via the git clone url
https://github.com/user/pkg.git should ideally have been supported too,
since that's what github encourages you to copy/paste as a reference)

martin
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