make sure dist/primer.css exists before linting

Author: bartveneman

package.json

@@ -25,6 +25,7 @@
     "fresh": "rm -rf node_modules; npm install",
     "dist": "script/dist.js",
     "lint": "npm-run-all -s lint-css lint-js",
+    "prelint-css": "npm run dist",
     "lint-css": "stylelint --quiet --syntax scss src/**/*.scss && constyble dist/primer.css --config=.constyblerc.json",
     "lint-js": "eslint script docs deprecations.js lib .storybook",
     "postpublish": "script/postpublish",