Bump node-sass from 4.13.0 to 4.13.1

Bumps [node-sass](https://github.com/sass/node-sass) from 4.13.0 to 4.13.1.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/node-sass/compare/v4.13.0...v4.13.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -56,7 +56,7 @@
     "html-webpack-plugin": "^3.2.0",
     "jest": "^24.1.0",
     "mini-css-extract-plugin": "^0.9.0",
-    "node-sass": "^4.13.0",
+    "node-sass": "^4.13.1",
     "prettier": "^1.19.1",
     "sass-loader": "^8.0.0",
     "style-loader": "^1.1.3",