v0.6.0

Added

• setDids(contact, dids): the write-side counterpart of getDids. Replaces a
  contact's did: entries (by the same scheme predicate, including mangled
  http(s)://did: urls) with the given list, carrying non-DID urlAddresses
  entries through untouched, labeling each DID entry 'did', trimming, dropping
  blanks, and collapsing exact repeats to the first occurrence.

Changed

• getDids now dedupes its result (exact comparison, first occurrence wins): a
  merge from another replica can leave the same DID on two entries, and a
  contact holding one DID twice means nothing beyond holding it once.