Warnings during build

[ricir]

During the build process, I receive numerous warnings like the one shown below:

Could this be due to a misconfiguration in my installation?

[JakeSteam]

Hmm I haven't seen that, but I think it depends on your local Jekyll version. Once this PR (or another) on the main minima theme is merged, I'll port the changes across. Regardless, the current warnings shouldn't break anything.