keepConnection should be true by default if pg.Client or pg.Pool is passed

[andreypopp]

Hi,

Thanks for the pg-structure!

Just some feedback on API ergonomics. I think it would make API more ergonomic if pg-structure would keep connections open if it passed pg.Client or pg.Pool — the justification is that if a user passed an initialised connection then they are responsible for its lifecycle.

[ozum]

Thanks for the suggestion.