update changelog for ghcr announcement

CHANGELOG.md

@@ -9,7 +9,7 @@ This release includes changes to the config file format, all of which are fully
 
 This release includes a database change. If you have `datastore.autoupgrade` set to `true` in your configuration, it will be automatically applied when you restart Ergo. Otherwise, you can update the database manually by running `ergo upgradedb` (see the manual for complete instructions).
 
-As part of this release, our official Docker images will move from Docker Hub to [the GitHub Container Registry at ghcr.io](https://ghcr.io); more details will be forthcoming with the final release.
+As part of this release, our official Docker images have moved from Docker Hub to the GitHub Container Registry, at [ghcr.io/ergochat/ergo](https://ghcr.io/ergochat/ergo). The `stable` and `master` tags correspond to the respective branches. Tagged releases (e.g. `v2.8.0`) are available under the corresponding named tags.
 
 Many thanks to [@ajaspers](https://github.com/ajaspers), [@delthas](https://github.com/delthas), [@mogad0n](https://github.com/mogad0n), [@majiru](https://github.com/majiru), [@ProgVal](https://github.com/ProgVal), and [@tacerus](https://github.com/tacerus) for contributing patches, to [@ajaspers](https://github.com/ajaspers) for contributing code review, to [@ajaspers](https://github.com/ajaspers), [@cxxboy](https://github.com/cxxboy), [@dallemon](https://github.com/dallemon), [@emersion](https://github.com/emersion), [@erikh](https://github.com/erikh), [@eskimo](https://github.com/eskimo), [@jwheare](https://github.com/jwheare), [@kylef](https://github.com/kylef), [@Mikaela](https://github.com/Mikaela), [@mogad0n](https://github.com/mogad0n), [@MystaraTheGreat](https://github.com/MystaraTheGreat), [@ProgVal](https://github.com/ProgVal), [@tacerus](https://github.com/tacerus), [@tamiko](https://github.com/tamiko), and [@xnaas](https://github.com/xnaas) for reporting issues and helping test, and to our translators for contributing translations.