Merge pull request #1137 from OpenBazaar/updateNodeSass

Update node sass for latest node

Author: rmisio

package.json

@@ -51,7 +51,7 @@
     "electron-winstaller": "2.5.2",
     "jsdom": "9.4.1",
     "mocha": "^2.5.3",
-    "node-sass": "^3.13.0",
+    "node-sass": "^4.7.2",
     "nodemon": "^1.9.2",
     "npm-run-all": "^2.2.0",
     "sinon": "^1.17.6"