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Cache miss might mean that provider records where offloaded to
datastore and need to be brough back up in order to have a consistent
cache entry.

update cid package through tree

DRY up NewDHT

improve perf of providers storage and gc

Remove outdated comment; fixes #23

fix filtering bug in find closest peers

Should ahve been PL before merge.

Standardize README and add MIT License

Usage section still needs to be filled out.

Feat/update deps

dht: degrade 'no addresses' from error to warning