* Update docker-compose.yml
Since you use healthcheck anyway, you get to verify that postgres is healthy
* Update README.md
Update the README with 'depends_on: postgresql: condition: service_healthy'
* Add zipline healthcheck to docker-compose.yml
* Add docker-compose healthcheck for zipline to README.md
* Update docker-compose.yml
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Co-authored-by: dicedtomato <35403473+diced@users.noreply.github.com>