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](sass/node-sass@v4.13.0...v4.13.1)

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

Author: dependabot[bot]

package-lock.json

@@ -29,7 +29,7 @@
     "imagemin-gifsicle": "^7.0.0",
     "jquery": "~3.0.0",
     "motion-ui": "~1.2.2",
-    "node-sass": "^4.13.0",
+    "node-sass": "^4.13.1",
     "owl.carousel": "^2.3.4",
     "what-input": "^4.1.3"
   },