fix eslint

Author: stevenjoezhang

lib/renderer.js

@@ -219,7 +219,7 @@ const tokenizer = {
 
 module.exports = function(data, options) {
   const { post_asset_folder, marked: markedCfg, source_dir } = this.config;
-  const { prependRoot, postAsset, dompurify, mangle } = markedCfg;
+  const { prependRoot, postAsset, dompurify } = markedCfg;
   const { path, text } = data;
 
   // exec filter to extend marked