Feature Request: Extensions

[JonRowe]

👋 Curious how one would go about enabling extensions in such a database? E.g postgis?

[bmizerany]

@JonRowe I haven't tried, but it seems like it should be as easy as installing the extensions using something like apt and then executing CREATE EXTENSION postgis;. I'm not sure when I'll have time to try this, but if you figure it out, please let me know. Bonus points for a PR with an addition to the README on how to do it! :)