Proper handling of transaction using promises

[officer-rosmarino]

I made a gist on how to properly handle transactions using pg and promises
Hopefully it is right and it can be added to the documentation.

You can find the gist here

[charmander]

That documentation already exists: https://node-postgres.com/features/transactions#a-pooled-client-with-async-await

[officer-rosmarino]

@charmander that is with async/await, i don't see anything with promises?

[charmander]

async/await is promises.

[officer-rosmarino]

@charmander well yes, I just thought maybe explict promises would have been useful

Not a problem though :)