update node-sass

Author: icebob

package-lock.json

@@ -82,7 +82,7 @@
     "mocha": "2.5.3",
     "mocha-generators": "1.2.0",
     "mocha-loader": "0.7.1",
-    "node-sass": "3.10.1",
+    "node-sass": "4.7.2",
     "phantomjs-prebuilt": "2.1.14",
     "pug": "2.0.0-beta11",
     "pug-loader": "2.3.0",