PhantomJS PATH not found (deploying to production)
While it works fine locally, when I try to deploy to production on Heroku it throws the following error:

```
PhantomJS not found on PATH
remote:        Phantom installation failed TypeError: Path must be a string. Received undefined
```

I use react-create-app and the https://github.com/mars/create-react-app-buildpack.git build pack on Heroku with yarn.

Any ideas?