build: fix prettier script to apply to scss as well, and run it

Author: fritz-c

package.json

@@ -9,7 +9,7 @@
     "clean:demo": "rimraf build",
     "start": "cross-env NODE_ENV=development TARGET=development webpack-dev-server --inline --hot",
     "lint": "eslint src examples",
-    "prettier": "prettier --single-quote --trailing-comma es5 --write \"{src,examples}/**/*.js\"",
+    "prettier": "prettier --single-quote --trailing-comma es5 --write \"{src,examples}/**/*.{js,scss}\"",
     "prepublishOnly": "npm run lint && npm run test && npm run build",
     "test": "jest",
     "test:watch": "jest --watchAll",