Update release notes

Signed-off-by: Mathias L. Baumann <[email protected]>

Author: Marenz

RELEASE_NOTES.md

@@ -12,6 +12,7 @@
 
 * A new class `SerializableRingbuffer` is now available, extending the `OrderedRingBuffer` class with the ability to load & dump the data to disk.
 * Add the `run(*actors)` function for running and synchronizing the execution of actors. This new function simplifies the way actors are managed on the client side, allowing for a cleaner and more streamlined approach. Users/apps can now run actors simply by calling run(actor1, actor2, actor3...) without the need to manually call join() and deal with linting errors.
+* The datasourcing actor now automatically closes all sending channels when the input channel closes.
 
 ## Bug Fixes