npm audit fix 😶

package.json

@@ -1,6 +1,6 @@
 {
   "name": "reveal.js",
-  "version": "3.9.0-beta",
+  "version": "3.9.0",
   "description": "The HTML Presentation Framework",
   "homepage": "http://revealjs.com",
   "subdomain": "revealjs",
@@ -25,8 +25,8 @@
   "devDependencies": {
     "express": "^4.16.2",
     "grunt": "^1.0.4",
-    "grunt-cli": "^1.3.2",
     "grunt-autoprefixer": "^3.0.4",
+    "grunt-cli": "^1.3.2",
     "grunt-contrib-connect": "^2.0.0",
     "grunt-contrib-cssmin": "^3.0.0",
     "grunt-contrib-jshint": "^2.0.0",
@@ -36,8 +36,8 @@
     "grunt-sass": "^3.0.2",
     "grunt-zip": "~0.17.1",
     "load-grunt-tasks": "^4.0.0",
-    "node-sass": "^4.13.0",
     "mustache": "^2.3.0",
+    "node-sass": "^4.13.1",
     "socket.io": "^2.2.0"
   },
   "license": "MIT"