get tree shaking working again

Author: jsdf

README.md

@@ -7,4 +7,6 @@ See it at https://hackernewsmobile.com
 
 Source is in [src/](src/), starting from [src/index.re](src/index.re)
 
-You can run the app locally with `yarn start`
+You can run the app locally with `yarn start`
+
+Build for deployment with `NODE_ENV=production yarn build`