docs: 0.4.0 Changelog

fix: FreeSegmentLedger now uses many pages (#21)

The FreeSegmentLedger has been updated to utilize multiple pages for tracking free segments.

closes #19

fix: 0.2.1

feat: field validation (#6)

* feat: Table field validation

Added `Validate` trait for validation. Added many common used validators into `prelude`

docs: README docs