Bump node-sass from 5.0.0 to 6.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 5.0.0 to 6.0.0.
- [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/v5.0.0...v6.0.0)

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

package.json

@@ -37,7 +37,7 @@
     "lodash.template": "^4.5.0",
     "micromatch": "^4.0.4",
     "mixin-deep": "^2.0.1",
-    "node-sass": "^5.0.0",
+    "node-sass": "^6.0.0",
     "regenerator-runtime": "^0.13.7",
     "set-value": "^4.0.0"
   },