Carry the municipality of a CEP that does not existHEADv0.2.0main

A 404 from the API now brings a "faixa" naming the municipality the CEP
would have belonged to, and NotFound carries it. A CEP that fails is
rarely a random number: it is usually someone who knows the city and
guessed the digits, so naming the city turns a dead end into an answer
the caller can show.

It stays an error. The range it carries is the CEPs that actually exist
there, not the bounds the Correios publish — those start at the very CEP
that just failed — and it is sparse, which is what "ceps" measures. The
field is decoration on a failure, so parsing it is entirely defensive:
absent, null or malformed all yield None rather than costing a clean
not-found.

Breaking: NotFound gained a field, hence 0.2.0.

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