Add html-pipeline-linkify_github to 3rd Party Extensions [ci skip]
Add html-pipeline-linkify_github to 3rd Party Extensions [ci skip]

gjtorikian/html-pipeline,github/html-pipeline,gjtorikian/html-pipeline,jch/html-pipeline,jch/html-pipeline,kbrock/html-pipeline,kbrock/html-pipeline,github/html-pipeline