Bump node-sass from 6.0.1 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 6.0.1 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/v6.0.1...v7.0.0)

---
updated-dependencies:
- dependency-name: node-sass
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -21,7 +21,7 @@
     "foreach-cli": "^1.8.1",
     "glob": "^7.1.4",
     "headr": "^0.0.4",
-    "node-sass": "^6.0.0",
+    "node-sass": "^7.0.0",
     "npm-run-all": "^4.1.5",
     "rimraf": "^3.0.2",
     "rollup": "^2.6.1",