Refactor code highlighting function to use template literals

README.md

@@ -184,13 +184,13 @@ const md = markdownit({
   highlight: function (str, lang) {
     if (lang && hljs.getLanguage(lang)) {
       try {
-        return '<pre><code class="hljs">' +
-               hljs.highlight(str, { language: lang, ignoreIllegals: true }).value +
-               '</code></pre>';
+        return `<pre><code class="hljs">
+          ${hljs.highlight(str, { language: lang, ignoreIllegals: true }).value}
+        </code></pre>`
       } catch (__) {}
     }
 
-    return '<pre><code class="hljs">' + md.utils.escapeHtml(str) + '</code></pre>';
+    return `<pre><code class="hljs">${md.utils.escapeHtml(str)}</code></pre>`
   }
 });
 ```