chore(deps-dev): 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](https://github.com/sass/node-sass/compare/v4.14.1...v7.0.0)

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

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

package.json

@@ -68,7 +68,7 @@
     "lerna": "2.11.0",
     "mocha": "^3.3.0",
     "node-gyp": "^7.1.0",
-    "node-sass": "^4.12.0",
+    "node-sass": "^7.0.0",
     "postcss": "^6.0.16",
     "postcss-loader": "^2.0.10",
     "prettier": "^1.11.1",