correct highlighting (_config.yml) see https://help.github.com/articles/page-build-failed-config-file-error/#fixing-highlighting-errors
correct highlighting (_config.yml) see https://help.github.com/articles/page-build-failed-config-file-error/#fixing-highlighting-errors

HeidiSeibold/HeidiSeibold.github.io,HeidiSeibold/HeidiSeibold.github.io,HeidiSeibold/HeidiSeibold.github.io