refactor: new is not necessary

https://nodejs.org/api/buffer.html#buffer_class_method_buffer_from_string_encoding

lib/filter.js

@@ -185,7 +185,7 @@ function logicBrotli () {
       assetPath.on('end', () => {
         if (assetTxt.length) {
           // Input has to be buffer for brotli
-          let input = new Buffer.from(assetTxt, 'utf-8')
+          let input = Buffer.from(assetTxt, 'utf-8')
           // brotli defaults to max compression level
           br.compress(input, (err, output) => {
             if (!err) {