Update _config.yml
Update _config.yml

You are attempting to use the 'pygments' highlighter, which is currently unsupported on GitHub Pages. Your site will use 'rouge' for highlighting instead. To suppress this warning, change the 'highlighter' value to 'rouge' in your '_config.yml'. For more information, see https://help.github.com/articles/page-build-failed-config-file-error/#fixing-highlighting-errors.
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