Bump node-sass from 4.14.1 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.14.1 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@v4.14.1...v7.0.0)

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

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

Author: dependabot[bot]

package.json

@@ -40,7 +40,7 @@
     "babel-jest": "^23.0.1",
     "babel-loader": "^8.0.4",
     "glob-all": "^3.1.0",
-    "node-sass": "^4.9.0",
+    "node-sass": "^7.0.0",
     "path": "^0.12.7",
     "purgecss-webpack-plugin": "^1.3.0",
     "sass-loader": "^7.0.1",