Update CHANGELOG

Author: duckontheweb

CHANGELOG.md

@@ -4,8 +4,14 @@
 
 ### Added
 
+- License file included in distribution ([#409](https://github.com/stac-utils/pystac/pull/409))
+- Links to Issues, Discussions, and documentation sites ([#409](https://github.com/stac-utils/pystac/pull/409))
+- Python minimum version set to `>=3.6` ([#409](https://github.com/stac-utils/pystac/pull/409))
+
 ### Changed
 
+- Package author to `stac-utils`, email to `stac@radiant.earth`, url to this repo ([#409](https://github.com/stac-utils/pystac/pull/409))
+
 ### Fixed
 
 ### Removed