Update sugarss to version 2.0.0 (#375)

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "eslint-plugin-prettier": "^2.2.0",
     "postcss-scss": "^2.0.0",
     "prettier": "~1.14.0",
-    "sugarss": "^1.0.0"
+    "sugarss": "^2.0.0"
   },
   "scripts": {
     "ci": "eslint . && ava",