v20.3.0

new features:

• db.addBoxer API changed so that boxer is now provided with the previous messageId of last know message (required for ssb-tribes)
• db.getFeedState(feedId, cb) provided for accessing previous message state (including previous messages queued for persistence)

bugs fixes:

• bulk publishing of > 1000 messages now working reliably
• private group auto-boxing fixed (by new features above)
• fixed test suite running on windows