Added og:image statement as per https://github.com/vjeantet/hugo-theme-casper/issues/33
Added og:image statement as per https://github.com/vjeantet/hugo-theme-casper/issues/33

vjeantet/hugo-theme-casper,jrdjz/hugo-theme-casper,vjeantet/hugo-theme-casper,caffeineflo/hugo-theme-casper,jrdjz/hugo-theme-casper,caffeineflo/hugo-theme-casper