possibility to use private repo's

[Haroenv]

This would be interesting for repo's that have a gh-pages branch, but are private, or for personal use.

This would use the visibility key present in the api.

https://developer.github.com/v3/repos/

[parkr]

I'm in! Would love to see a pull request when you have time.

[benbalter]

To note, if the repo's private, we shouldn't cache it, if we do, via #7.

[Crunch09]

Hi all,
just to clarify do you mean access to something like site.github.repositories instead of only site.github.public_repositories ?

[Haroenv]

Maybe .repositories and .private_repositories

[jekyllbot]

This issue has been automatically marked as stale because it has not been commented on for at least
one month.

The resources of the Jekyll team are limited, and so we are asking for your help.

If you can still reproduce this error on the 3.1-stable or master branch,
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If this is a feature request, please consider building it first as a plugin. Jekyll 3 introduced
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