Add YAML to list of supported syntaxes (#1957)
Add YAML to list of supported syntaxes (#1957)


highlightjs/highlight.js,MakeNowJust/highlight.js,highlightjs/highlight.js,MakeNowJust/highlight.js,highlightjs/highlight.js,highlightjs/highlight.js,carlokok/highlight.js,carlokok/highlight.js,MakeNowJust/highlight.js,carlokok/highlight.js,isagalaev/highlight.js,carlokok/highlight.js,palmin/highlight.js,palmin/highlight.js,palmin/highlight.js,isagalaev/highlight.js