Update release notes

Signed-off-by: Sahas Subramanian <[email protected]>

Author: shsms

RELEASE_NOTES.md

@@ -35,6 +35,11 @@ This release includes a new `ConfigManager` class to simplify managing the confi
 
     * `ConfigManagingActor`: Raise a `ValueError` if the `config_files` argument an empty sequence.
 
+- The power manager now uses a new algorithm described [here](https://frequenz-floss.github.io/frequenz-sdk-python/v1.0-dev/user-guide/microgrid-concepts/#frequenz.sdk.microgrid--setting-power), and that leads to the following changes around how `propose_power` is called.
+
+    * The `microgrid.new_*_pool` methods no longer accept a `set_operating_point` parameter.
+    * Power proposals without bounds made through the `propose_power` methods would no longer limit the bounds for lower priority actors, but will shift their available bounds.  When bounds are specified, they will be used to restrict the bounds for lower priority actors.
+
 ## New Features
 
 - `frequenz.sdk.config`