updated "node-sass"

package.json

@@ -29,7 +29,7 @@
     "css-loader": "^0.28.9",
     "extract-text-webpack-plugin": "^3.0.2",
     "ignore-loader": "^0.1.2",
-    "node-sass": "^4.8.3",
+    "node-sass": "^4.11.0",
     "optimize-css-assets-webpack-plugin": "^3.2.0",
     "postcss-loader": "^2.0.10",
     "rimraf": "^2.6.2",