v1.0.0-rc.3

Added

• (Experimental) support for Python 3.10 (#473)
• LabelTask enum in pystac.extensions.label with recommended values for
  "label:tasks" field (#484)
• LabelMethod enum in pystac.extensions.label with recommended values for
  "label:methods" field (#484)
• Label Extension summaries (#484)
• Timestamps Extension summaries (#513)
• Define equality and __repr__ of RangeSummary instances based on to_dict
  representation (#513)
• Sat Extension summaries (#509)
• Catalog.get_collections for getting all child
  Collections for a catalog, and Catalog.get_all_collections for recursively getting
  all child Collections for a catalog and its children (#511)

Changed

• Renamed Asset.properties -> Asset.extra_fields and Link.properties ->
  Link.extra_fields for consistency with other STAC objects
  (#510)

Fixed

• Bug in pystac.serialization.identify_stac_object_type where invalid objects with
  stac_version == 1.0.0 were incorrectly identified as Catalogs
  (#487)
• Link constructor classes (e.g. Link.from_dict, Link.canonical, etc.) now return
  the calling class instead of always returning the Link class
  (#512)
• Sat extension now includes all fields defined in v1.0.0
  (#509)

Removed

• STAC_IO class in favor of StacIO. This was deprecated in v1.0.0-beta.1 and has
  been removed in this release. (#490)
• Support for Python 3.6 (#500)