Bump node-sass from 4.12.0 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.12.0 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@v4.12.0...v7.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -65,7 +65,7 @@
 		"html-webpack-plugin": "^3.2.0",
 		"mini-css-extract-plugin": "^0.7.0",
 		"mocha": "^6.1.4",
-		"node-sass": "^4.9.3",
+		"node-sass": "^7.0.0",
 		"raw-loader": "^3.0.0",
 		"react": "^16.5.2",
 		"react-dom": "^16.5.2",