Make regex parsing file names global

Author: Ty

src/index.js

@@ -129,7 +129,7 @@ export default async ({ markdownAST }, options = {}) => {
     let html = content.div;
     if (query.highlights.length > 0) {
       const $ = cheerio.load(content.div);
-      const file = query.file.replace(/[^a-zA-Z0-9_]+/, "-");
+      const file = query.file.replace(/[^a-zA-Z0-9_]+/g, "-");
       query.highlights.forEach(line => {
         $(`#file-${file.toLowerCase()}-LC${line}`).addClass("highlighted");
       });