Update dependency node-sass to v4.13.1 [SECURITY]

Author: renovate-bot

package.json

@@ -96,7 +96,7 @@
     "jsdom": "15.1.1",
     "lint-staged": "9.2.1",
     "mini-css-extract-plugin": "0.8.0",
-    "node-sass": "4.12.0",
+    "node-sass": "4.13.1",
     "optimize-css-assets-webpack-plugin": "5.0.3",
     "prettier": "1.18.2",
     "pretty-quick": "1.11.1",