chore(deps-dev): bump node-sass from 3.13.1 to 4.14.1

Bumps [node-sass](https://github.com/sass/node-sass) from 3.13.1 to 4.14.1.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](sass/node-sass@v3.13.1...v4.14.1)

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

package.json

@@ -36,7 +36,7 @@
     "browserify": "^13.0.1",
     "coveralls": "^2.11.9",
     "html-minifier": "^2.1.2",
-    "node-sass": "^3.7.0",
+    "node-sass": "^4.14.1",
     "nyc": "^7.1.0",
     "standard-version": "^8.0.2"
   },