v0.2.3: Merge pull request #10 from ibuildthecloud/master

Fix pessimestic update revision check

v0.2.2: Merge pull request #9 from ibuildthecloud/master

Detect "unique constraint" errors and return ErrKeyExists

v0.2.1: Merge pull request #8 from ibuildthecloud/master

Ensure that polling doesn't skip initial rows

Add dqlite

Merge pull request #7 from ibuildthecloud/dqlite

Add dqlite support

v0.1.1: Merge pull request #3 from ibuildthecloud/gap

Attempt to ensure that watch is always sequential