fixing https://travis-ci.org/AAROC/aaroc.github.io/builds/88745019 deprecation warning (Deprecation: The 'pygments' configuration option has been renamed to 'highlighter'.)
fixing https://travis-ci.org/AAROC/aaroc.github.io/builds/88745019 deprecation warning (Deprecation: The 'pygments' configuration option has been renamed to 'highlighter'.)

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