Update documentup.min.js

documentup.min.js

-this.DocumentUp={},DocumentUp.document=function(a){var b;"string"==typeof a?(b=a,a=null):(b=a.repo,delete a.repo),window.callback=function(b){b.status===200&&(document.open(),document.write(b.html),document.close(),a&&a.afterRender&&typeof a.afterRender=="function"&&a.afterRender())};var c=document.createElement("script");c.src="http://documentup.com/"+b,a?c.src+="?config="+encodeURIComponent(JSON.stringify(a))+"&callback=callback":c.src+="?callback=callback",document.getElementsByTagName("head")[0].appendChild(c)}
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+this.DocumentUp={},DocumentUp.document=function(a){var b;"string"==typeof a?(b=a,a=null):(b=a.repo,delete a.repo),window.callback=function(b){b.status===200&&(document.open(),document.write(b.html),document.close(),a&&a.afterRender&&typeof a.afterRender=="function"&&a.afterRender())};var c=document.createElement("script");c.src="//documentup.com/"+b,a?c.src+="?config="+encodeURIComponent(JSON.stringify(a))+"&callback=callback":c.src+="?callback=callback",document.getElementsByTagName("head")[0].appendChild(c)}