Update release notes

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

RELEASE_NOTES.md

@@ -39,6 +39,8 @@
       LoggingConfig(root_logger=RootLoggerConfig(level="ERROR"))
       ```
 
+* The SDK now depends on the `frequenz-client-microgrid` v0.7.x series. The main change is now all component and microgrid IDs need to be passed using the wrapper classes `ComponentId`/`MicrogridId` instead of `int`.
+
 ## New Features
 
 <!-- Here goes the main new features and examples or instructions on how to use them -->