Prepare release notes for release (#162)

Author: matthias-wende-frequenz

RELEASE_NOTES.md

@@ -1,17 +1,5 @@
 # Frequenz Common API 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
 
 - Add a energy message for electricity trading markets
-
-## Bug Fixes
-
-<!-- Here goes notable bug fixes that are worth a special mention or explanation -->