Reset release notes after release

Signed-off-by: Mathias L. Baumann <[email protected]>

Author: Marenz

RELEASE_NOTES.md

@@ -1,7 +1,17 @@
 # Frequenz Dispatch Client 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
 
-* Update BaseApiClient to get the http2 keepalive feature.
-* Some Methods from the high-level API have been moved to this repo: The dispatch class now offers: `until`, `started`, `next_run` and `next_run_after`.
-* Add `start_immediately` support to the `create` method. You can now specify "NOW" as the start time to trigger immediate dispatch. Note: While the dispatch CLI previously allowed this by converting "NOW" to a timestamp client-side before sending it to the server, this functionality is now supported directly on the server side!
+<!-- Here goes the main new features and examples or instructions on how to use them -->
+
+## Bug Fixes
+
+<!-- Here goes notable bug fixes that are worth a special mention or explanation -->