Add prepublish

Author: bokuweb

package.json

@@ -78,6 +78,7 @@
     "cypress:run": "cypress run",
     "cypress:open": "cypress open",
     "build-storybook": "build-storybook",
+    "prepublish": "npm run build",
     "format": "prettier-eslint --write --single-quote --semi=true \"src/**/*.js\" ",
     "deploy": "npm run build-storybook && gh-pages -d storybook-static"
   },