Fix font size for mono font on pdf output

Author: SamyPesse

lib/generate/ebook/index.js

@@ -61,6 +61,7 @@ Generator.prototype.finish = function() {
                 "--margin-bottom": String(pdfOptions.margin.bottom),
                 "--pdf-add-toc": Boolean(pdfOptions.toc),
                 "--pdf-default-font-size": String(pdfOptions.fontSize),
+                "--pdf-mono-font-size": String(pdfOptions.fontSize),
                 "--paper-size": String(pdfOptions.paperSize),
                 "--pdf-page-numbers": Boolean(pdfOptions.pageNumbers)
             });