Do not cache js bundle when deploying on heroku (#4444)
Do not cache js bundle when deploying on heroku (#4444)

JS files should note be cached. Configure heroku-buildpack-static
to prevent that. See
https://github.com/gatsbyjs/gatsby/blob/master/docs/docs/caching.md#javascript
mingaldrichgan/gatsby,mingaldrichgan/gatsby,gatsbyjs/gatsby,mingaldrichgan/gatsby,ChristopherBiscardi/gatsby,ChristopherBiscardi/gatsby,0x80/gatsby,0x80/gatsby,0x80/gatsby,fk/gatsby,gatsbyjs/gatsby,fk/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,fk/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby