Fix variable name in readme

[kabilar]

Description and changes

• Based on the example discussed, it appears that the variable name should change from site.github.url to site.github.zip_url.

[welcome]

Welcome! Congrats on your first pull request to the Slate theme. If you haven't already, please be sure to check out the contributing guidelines.

[kabilar]

Hi @tsusdere @parkr @benbalter, I am just following up to see if you would be able to review/merge this pull request? Thank you.

[parkr]

Might need a rebase. I don't think I have merge permissions anymore.

[kabilar]

Thank you, @parkr. I just rebased.

[tsusdere]

👋🏻 Thank you for contributing! Should be good to merge when you decide to do so @kabilar

[kabilar]

Thank you @tsusdere. Looks like I don't have merge permissions for this repo.

[welcome]

Congrats on getting your first pull request to the Slate theme merged! Without amazing humans like you submitting pull requests, we couldn’t run this project. You rock! 🎉

If you're interested in tackling another bug or feature, take a look at the open issues, especially those labeled help wanted.

[tsusdere]

@kabilar oh okay, went ahead and merged your changes, thank you again for contributing!