Clear release notes (#83)

Author: llucax

RELEASE_NOTES.md

@@ -6,16 +6,11 @@
 
 ## Upgrading
 
-- The metrics and components enums `.from_proto()` are deprecated, please use the new `enum_from_proto()` instead.
-- Some minimum dependencies have been bumped, you might need to update your minimum dependencies too:
-
-    * `frequenz-api-common` to 0.6.1
-    * `frequenz-core` to 1.0.2
+<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
 
 ## New Features
 
-- A new module `frequenz.client.common.enum_proto` has been added, which provides a generic `enum_from_proto()` function to convert protobuf enums to Python enums.
-- The `frequenz.client.common.microgrid.ComponentCategory` was extended to include the missing categories.
+<!-- Here goes the main new features and examples or instructions on how to use them -->
 
 ## Bug Fixes