update changelog with ogobrechts changes
update changelog with ogobrechts changes

ogobrecht/dokuwiki-plugin-revealjs,ogobrecht/dokuwiki-plugin-revealjs,neuralyzer/dokuwiki-plugin-revealjs,ogobrecht/dokuwiki-plugin-revealjs,neuralyzer/dokuwiki-plugin-revealjs,neuralyzer/dokuwiki-plugin-revealjs