Update Node-Sass

Author: philwareham

package.json

@@ -31,7 +31,7 @@
     "grunt-sass": "1.2.1",
     "grunt-sass-lint": "0.2.0",
     "load-grunt-tasks": "~3.5",
-    "node-sass": "3.8.0",
+    "node-sass": "3.9.0",
     "sass-lint": "1.9.1"
   },
   "scripts": {