Update dependency sugarss to v4 (#461)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package.json

@@ -33,7 +33,7 @@
     "postcss": "^8.0.0",
     "postcss-scss": "^3.0.0",
     "prettier": "~2.3.0",
-    "sugarss": "^3.0.0"
+    "sugarss": "^4.0.0"
   },
   "peerDependencies": {
     "postcss": "^8.0.0"