chore(dependencies): Bump stylelint from 7.12.0 to 8.3.1 (#35)

Bumps [stylelint](https://github.com/stylelint/stylelint) from 7.12.0 to 8.3.1.
- [Release notes](https://github.com/stylelint/stylelint/releases)
- [Changelog](https://github.com/stylelint/stylelint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/stylelint/stylelint/compare/7.12.0...8.3.1)

package.json

@@ -98,7 +98,7 @@
     "extract-text-webpack-plugin": "~3.0",
     "laravel-mix": "~1.6",
     "rimraf": "~2.6",
-    "stylelint": "~7.12",
+    "stylelint": "~8.3",
     "stylelint-config-standard": "~18.0",
     "stylelint-webpack-plugin": "^0.9.0"
   },