Add a flag to toggle legacy postgres support

[ponychicken]

Postgres 12 has had the final release in 2024.
Fixes #50

[ponychicken]

hi @cheerfulstoic could you have a look at this?

[cheerfulstoic]

Hey, yes! Thank you so much! Since this is a PG 13 thing which is end-of-lifeing soon, it would be nice for people to not have to think about having to set legacy_postgres_support?. I'm going to merge this and see if I can't make it automatically just do CREATE OR REPLACE from version 14 onwards. I guess there are probably some changes between 13.3.4, but I'd rather make the check easier / more reliable by just checking the first part of the version

[cheerfulstoic]

Ok, 0.14.0 has been released and it should automatically figure out if it should use DROP/CREATE or CREATE OR REPLACE

[ponychicken]

amazing, thats an even better solution!