Bump clean-css-cli from 4.3.0 to 5.0.1

Bumps [clean-css-cli](https://github.com/jakubpawlowicz/clean-css-cli) from 4.3.0 to 5.0.1.
- [Release notes](https://github.com/jakubpawlowicz/clean-css-cli/releases)
- [Changelog](https://github.com/jakubpawlowicz/clean-css-cli/blob/master/History.md)
- [Commits](https://github.com/jakubpawlowicz/clean-css-cli/compare/v4.3.0...v5.0.1)

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

package.json

@@ -10,7 +10,7 @@
     "@babel/core": "^7.4.5",
     "@babel/preset-env": "^7.4.5",
     "chalk": "^4.0.0",
-    "clean-css-cli": "^4.3.0",
+    "clean-css-cli": "^5.0.1",
     "core-js": "^3.1.4",
     "cross-env": "^7.0.2",
     "eslint": "^7.0.0",