chore(package): update node-sass to version 4.6.1

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
     "grunt-sass": "2.0.0",
     "grunt-sass-lint": "0.2.4",
     "load-grunt-tasks": "~3.5",
-    "node-sass": "4.6.0",
+    "node-sass": "4.6.1",
     "sass-lint": "1.12.1"
   },
   "browserslist": [