- Bounding envelopes are densified at higher precision in transform_bounds to
  fix #1411.
- Add LERC compression to enums.Compression (#1412).
- The reproject() function now passes dst_alpha properly to _reproject(), which
  unlocks materialization of warp destination alpha band masks (#1417).
- The --dimensions and --src-bounds options of rio-warp can be used together
  as expected (#1418).