Update release notes

Signed-off-by: camille-bouvy-frequenz <[email protected]>

Author: camille-bouvy-frequenz

RELEASE_NOTES.md

@@ -8,10 +8,13 @@
 
 * Updated frequenz-client-common version range to >=0.1.0, <0.4.0
 * Upgraded grpcio to >=1.68.1, <2 and protobuf to >=5.29.2, <6 to resolve compatibility issues 
+* Unify Public Trades streaming and listing (to align with the proto changes in v0.5.0)
+    * Removed `list_public_trades`
+    * Replaced `public_trades_stream` with `receive_public_trades`
+    * `receive_public_trades` now supports an optional time range (`start_time`, `end_time`)
 
 ## New Features
 
-<!-- Here goes the main new features and examples or instructions on how to use them -->
 
 ## Bug Fixes