Update sugarss to version 2.0.0 (postcss#237)

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "nyc": "^11.0.2",
     "postcss-import": "^12.0.0",
     "prettier": "~1.14.0",
-    "sugarss": "^1.0.0",
+    "sugarss": "^2.0.0",
     "uuid": "^3.0.1"
   },
   "files": [