updated buildpack URL after merge with PR #40

[abernicchia-heroku]

Now it's also necessary to publish the buildpack so the Heroku Elements page (basically README.md) for the buildpack (https://elements.heroku.com/buildpacks/postgrest/postgrest-heroku) is aligned with GitHub too - see https://devcenter.heroku.com/articles/buildpack-registry#publishing-a-buildpack-version

[steve-chavez]

It's been a while since I've used Heroku.

@abernicchia-heroku I was wondering, would you like to help us in maintaining this repo?

What would you need to publish the buildpack?

[abernicchia-heroku]

@steve-chavez yes, sure I can help! However, it is needed to find the original creator who registered the Heroku buildpack for the first time. As per the documentation https://devcenter.heroku.com/articles/buildpack-registry#namespaces-and-buildpack-ownership a buildpack can be owned by an individual (e.g. Heroku personal account) or a Heroku Team. If the latter option has been used you can add me to that Team so I can manage it, otherwise, I would need the user credentials to access.