GitHub has all the documentation for every version that’s ever existed, the docs site is just GitHub pages so you can go back through as many versions as you want. There is also an upgrade guide for going from version 3 to version 4 which tells you everything that changed, it’s just a wiki on GitHub (linked in the docs)
This works as well (I just picked October 2019, so it’s prior to that version but they only changed internal not the external API so it should be the same):