chore: update CHANGELOG.md

CHANGELOG.md

@@ -3,6 +3,9 @@
 - Ongeki: cache and mu3.ini config are now split per-profile (requires mu3-mods 3.7+)
 - Ongeki: added the few config options of mu3.ini that aren't available in TestMenuConfig, or require a restart
 - Chunithm: added Lumi+ patches
+- Added support for a non-standard `games` manifest entry intended for local packages
+    - Expected to be an array containing "ongeki", "chunithm" or both
+    - Example: { "games": ["ongeki"] }
 - Added a button linking to the profile config folder
 - Fixed the button linking to the data folder showing up when the folder does not exist
 - Uninstalled tool packages are no longer automatically deselected, as that caused issues