Update release notes

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

Author: shsms

RELEASE_NOTES.md

@@ -1,5 +1,19 @@
 # Frequenz Python SDK Release Notes
 
+## Summary
+
+<!-- Here goes a general summary of what this release is about -->
+
+## Upgrading
+
+<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
+
+## New Features
+
+<!-- Here goes the main new features and examples or instructions on how to use them -->
+
 ## Bug Fixes
 
 - Bump the `grpclib` dependency to pull a fix for using IPv6 addresses.
+
+- Allow setting `api_power_request_timeout` in `microgrid.initialize()`.  This was supposed to be possible since the last release, but wasn't until now.