Update devDependencies

Gruntfile.js

@@ -7,6 +7,7 @@ module.exports = function (grunt) {
             development: {
                 options: {
                     compress: true,
+                    javascriptEnabled: true,
                 },
                 files: {
                     "./public/assets/stylesheet/application.css": "./public/assets/stylesheet/application.less",

package.json

@@ -4,17 +4,17 @@
   "description": "Attendize Ticketing Platform",
   "main": "public/index.php",
   "dependencies": {
-    "less": "~1.7.0"
+    "less": "^3.9.0"
   },
   "devDependencies": {
-    "bower": "^1.8.4",
+    "bower": "^1.8.8",
-    "grunt": "^0.4.5",
+    "grunt": "^1.0.3",
-    "grunt-cli": "^1.2.0",
+    "grunt-cli": "^1.3.2",
-    "grunt-contrib-concat": "^0.5.1",
+    "grunt-contrib-concat": "^1.0.1",
-    "grunt-contrib-less": "^0.12.0",
+    "grunt-contrib-less": "^2.0.0",
-    "grunt-contrib-uglify": "^0.6.0",
+    "grunt-contrib-uglify": "^4.0.0",
-    "grunt-contrib-watch": "^0.6.1",
+    "grunt-contrib-watch": "^1.1.0",
-    "laravel-elixir": "*"
+    "laravel-elixir": "6.0.0-18"
   },
   "scripts": {
     "build-frontend": "grunt",