Fix behaviour and typespec of last_updated/0 #77
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The current implementation of
Money.ExchangeRates.last_updated/0keeps returningnilas it expects the cache to return an{:ok, %DateTime{}}tuple but it actually returns a%DateTime{}.In addition, the documentation, typespec and implementation all disagree on the return type of this function. This PR fixes both the implementation and typespec to align with the documented behaviour.
The cache layer now returns
{:ok, %DateTime{}}or{:error, reason}tuples which are forwarded to the caller in the facade module.