Update current maintainers in AUTHORS
Update current maintainers in AUTHORS

I took names from the GitHub org owners. Feel free to tweak it
further if needed.

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