Update dependencies.

package.json

@@ -23,12 +23,12 @@
     "node": ">=4.0.0"
   },
   "devDependencies": {
-    "express": "^4.15.2",
+    "express": "^4.16.2",
     "grunt": "^1.0.1",
     "grunt-autoprefixer": "^3.0.4",
     "grunt-cli": "^1.2.0",
     "grunt-contrib-connect": "^1.0.2",
-    "grunt-contrib-cssmin": "^2.1.0",
+    "grunt-contrib-cssmin": "^2.2.1",
     "grunt-contrib-jshint": "^1.1.0",
     "grunt-contrib-qunit": "~1.2.0",
     "grunt-contrib-uglify": "^2.3.0",