Rename deprecated option gems to plugins
Rename deprecated option gems to plugins

This is the recommended configuration since jekyll 3.5.0
https://github.com/jekyll/jekyll/blob/master/History.markdown#350--2017-06-18

jimmyti/jimmyti.github.io,jimmyti/jimmyti.github.io,jimmyti/jimmyti.github.io,dalton-cole/dalton-cole.github.io,dalton-cole/dalton-cole.github.io