Changes

/* Any JavaScript here will be loaded for all users on every page load. */

mw.loader.load( 'https://cdn.rawgit.com/prtksxna/persistent-toc/master/ptoc.css', 'text/css' );

mw.loader.load( 'https://cdn.rawgit.com/prtksxna/persistent-toc/master/ptoc.js', 'text/javascript' );