Add `__conform__` to work directly with Postgres data types

[mx-moth]

Like I did in django-postgres-composite-types

[zartux]

I'm curious what this means. Is __conform__ documented anywhere? Might this be related to #2?

[mx-moth]

This is about using native enum types in Postgres. Magic with the undocumented __conform__ method is required to work with custom types in Postgres using psycopg2.

[danni]

Do you mean django-postgres-composite-types ?

[mx-moth]

Yep, I have no idea how I typo'd that quite so badly.