Fixing popper.js loading

Fixing popper.js loading

Author: rsm23

src/bootstrap4-stubs/webpack.mix.js

@@ -15,7 +15,7 @@ mix.autoload({
     jquery: ['$', 'window.jQuery', 'jQuery'],
     tether: ['window.Tether', 'Tether'],
     'tether-shepherd': ['Shepherd'],
-    'popper.js/dist/umd/popper.js': ['Popper']
+    'popper.js/dist/popper.js': ['Popper']
 })
     .js('resources/assets/js/app.js', 'public/js')
     .sass('resources/assets/sass/app.scss', 'public/css')