message: CHANGES entry for OwnedLayer
diff: - <https://github.com/georust/gdal/pull/250>
  +- **Breaking**: Add `gdal::vector::OwnedLayer`, `gdal::vector::LayerAccess` and `gdal::vector::layer::OwnedFeatureIterator`. This requires importing `gdal::vector::LayerAccess` for using most vector layer methods.
  +
  + - https://github.com/georust/gdal/pull/238
  +
  ## 0.12
  - Bump Rust edition to 2021
  