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[add note] Jekyll 3 requires newer version of Ruby. #4461
I was linked to the upgrade page from Github blog and there's no warning or note specifying the requirement of Jekyll 3 on Ruby ver. >=2.0.0 on this page
I wrote a script to upgrade jekyll, rebuild the sites and push them live on my development server but it failed because I missed the requirement.
Hope this helps others who will only read the 'upgrading/2-to-3' article.