feat: update changelog for v1.8.2

Author: gadomski

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## [Unreleased]
 
+## [v1.8.2] - 2023-07-12
+
 ### Fixed
 
 - Explicitly re-export HREF from `link` ([#1182](https://github.com/stac-utils/pystac/pull/1182))
@@ -749,6 +751,7 @@ use `Band.create`
 Initial release.
 
 [Unreleased]: <https://github.com/stac-utils/pystac/compare/v1.8.2..main>
+[v1.8.2]: <https://github.com/stac-utils/pystac/compare/v1.8.1..v1.8.2>
 [v1.8.1]: <https://github.com/stac-utils/pystac/compare/v1.8.0..v1.8.1>
 [v1.8.0]: <https://github.com/stac-utils/pystac/compare/v1.7.3..v1.8.0>
 [v1.7.3]: <https://github.com/stac-utils/pystac/compare/v1.7.2..v1.7.3>