v4.0.0

Features

• store blocks under multihash key (#211) (06a9e27)

BREAKING CHANGES

• • Repo version incremented to 8, requires a migration

• Blocks are now stored using the multihash, not the full CID
• repo.blocks.query({}) now returns an async iterator that yields blocks
• repo.blocks.query({ keysOnly: true }) now returns an async iterator that yields CIDs
  • Those CIDs are v1 with the raw codec

Co-authored-by: achingbrain [email protected]