Prepare release notes for the v0.6.0 release

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

Author: llucax

RELEASE_NOTES.md

@@ -1,9 +1,5 @@
 # Frequenz Microgrid API Client Release Notes
 
-## Summary
-
-<!-- Here goes a general summary of what this release is about -->
-
 ## Upgrading
 
 - `ApiClient`:
@@ -18,7 +14,3 @@
 ## New Features
 
 - The client now inherits from `frequenz.client.base.BaseApiClient`, so it provides a few new features, like `disconnect()`ing or using it as a context manager. Please refer to the [`BaseApiClient` documentation](https://frequenz-floss.github.io/frequenz-client-base-python/latest/reference/frequenz/client/base/client/#frequenz.client.base.client.BaseApiClient) for more information on these features.
-
-## Bug Fixes
-
-<!-- Here goes notable bug fixes that are worth a special mention or explanation -->