Clear release notes (#111)

RELEASE_NOTES.md

@@ -2,25 +2,16 @@
 
 ## Summary
 
-This release improves the performance of the `ComponentMetricsResamplingActor`, and fixes a bug in the `LogicalMeter` that was causing it to crash.
+<!-- Here goes a general summary of what this release is about -->
 
 ## Upgrading
 
-- `frequenz.sdk.timseries`:
-  - The resample classes (`GroupResampler`, `Resampler`, `ResamplingFunction`) where removed and the replacement classes are hidden for now, as they are going through a rewrite.
+<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with --> 
 
 ## New Features
 
-- New in `frequenz.sdk.timeseries`:
-
-  - `Source` and `Sink` types to work generically with streaming timeseries.
-
-- New `frequenz.sdk.timeseries.resampling` module with:
-  - `Resampler` class that works on timseries `Source` and `Sink`.
-  - `ResamplingFunction` (moved from `frequenz.sdk.timeseries`).
-  - `ResamplingError` and `SourceStoppedError` exceptions.
-  - `average` function (the default resampling function).
+<!-- Here goes the main new features and examples or instructions on how to use them -->
 
 ## Bug Fixes
 
-- The Resampling actor sends None values out when there is no data from a component. The logical meter used to raise an exception if it saw a `None` value from any of its streams.  The logical meter is now able to handle `None` values by propagating the `None` values,  or treating them as `0`s.
+<!-- Here goes notable bug fixes that are worth a special mention or explanation -->