Updated missing url https://raw.github.com/Polychart/polychart2/develop/polychart2.standalone.js to https://cdn.jsdelivr.net/gh/polychart/polychart2/develop/polychart2.standalone.js
Modified http://cdnjs.cloudflare.com/ajax/libs/prettify/188.0.0/prettify.js to a secure url
https://raw.github.com/Polychart/polychart2/develop/polychart2.standalone.js
https://cdnjs.cloudflare.com/ajax/libs/prettify/188.0.0/prettify.js