Update release notes

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

Author: llucax

RELEASE_NOTES.md

@@ -6,11 +6,28 @@
 
 ## Upgrading
 
-<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with --> 
+- `frequenz.sdk.timseries`:
+  - The resample classes in the `frequenz.sdk.timseries` were removed. Use the new `frequenz.sdk.timseries.resampling.Resampler` class instead.
+  - The `ResamplingFunction` was moved to the new module `frequenz.sdk.timseries.resampling`.
+
+- `frequenz.sdk.actor.ComponentMetricsResamplingActor`:
+  - The constructor now requires to pass all arguments as keywords.
+  - The following constructor arguments were renamed to make them more clear:
+    - `subscription_sender` -> `data_sourcing_request_sender`
+    - `subscription_receiver` -> `resampling_request_receiver`
+
 
 ## New Features
 
-<!-- Here goes the main new features and examples or instructions on how to use them -->
+- 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).
 
 ## Bug Fixes