Use const instead of let

Author: matthieumota

symfony/webpack-encore-bundle/1.0/assets/js/app.js

@@ -9,6 +9,6 @@
 require('../css/app.css');
 
 // Need jQuery? Install it with "yarn add jquery", then uncomment to require it.
-// let $ = require('jquery');
+// const $ = require('jquery');
 
 console.log('Hello Webpack Encore! Edit me in assets/js/app.js');