chore(deps-dev): bump node-sass from 4.13.1 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.13.1 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@v4.13.1...v7.0.0)

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

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

package.json

@@ -11,7 +11,7 @@
     "babel-preset-stage-2": "^6.24.1",
     "babelify": "^8.0.0",
     "browserify": "^16.1.0",
-    "node-sass": "^4.9.0",
+    "node-sass": "^7.0.0",
     "postcss-cli": "^5.0.0"
   },
   "dependencies": {