Bump node-sass from 4.9.2 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.9.2 to 7.0.0.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](sass/node-sass@v4.9.2...v7.0.0)

---
updated-dependencies:
- dependency-name: node-sass
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package.json

@@ -17,7 +17,7 @@
     "get-browser-language": "1.0.0",
     "intersection-observer": "0.5.0",
     "lodash": "4.17.10",
-    "node-sass": "4.9.2",
+    "node-sass": "7.0.0",
     "raf": "3.4.0",
     "react": "16.12.0",
     "react-cursor-position": "2.5.0",