Update postal codes file

[petterroea]

The postal code lacks several postal codes. We should update it, using this list:

https://data.norge.no/data/posten-norge/postnummer-i-norge

[halvors]

What postal codes is missing?

[petterroea]

Multiple. I hand patched one earlier today, but looking at the list i think we should just re-add everything

[halvors]

Yeah i know, but it's an hassle as it's not provided as SQL.

[halvors]

Wait, it's actually just a json file now.