Update webpack 3.1.0 et al

resources/assets/build/helpers/hmr-client.js

@@ -0,0 +1,7 @@
+const hotMiddlewareScript = require('webpack-hot-middleware/client?noInfo=true&timeout=20000&reload=true');
+
+hotMiddlewareScript.subscribe(event => {
+  if (event.action === 'reload') {
+    window.location.reload();
+  }
+});