Prepare release notes for v0.6.1 (#82)

Author: shsms

RELEASE_NOTES.md

@@ -1,17 +1,5 @@
 # Frequenz Client Base Library 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
 
 - Fixes a bug in creating grpc channels from ipv6 URIs.