Clear release notes after release (#139)

Author: flora-hofmann-frequenz

RELEASE_NOTES.md

@@ -6,16 +6,10 @@
 
 ## Upgrading
 
-* The CLI tool is moved to dedicated folder.
-* Timestamps of aggregated (formula) requests are now timezone-aware.
-
 <!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
 
 ## New Features
 
-* Support data requests for multiple component IDs from command line.
-* Support for passing formula strings as a `cid` argument from the command line.
-
 <!-- Here goes the main new features and examples or instructions on how to use them -->
 
 ## Bug Fixes