chore(deps): update dependency node-sass to v4.13.0 (#462)

Author: renovate[bot]

package-lock.json

@@ -70,7 +70,7 @@
     "jest-serializer-vue": "2.0.2",
     "mini-css-extract-plugin": "0.8.0",
     "mutationobserver-shim": "0.3.3",
-    "node-sass": "4.12.0",
+    "node-sass": "4.13.0",
     "normalize.css": "8.0.1",
     "optimize-css-assets-webpack-plugin": "5.0.3",
     "postcss": "7.0.18",