Clear release notes (#58)

Author: llucax

RELEASE_NOTES.md

@@ -2,60 +2,16 @@
 
 ## Summary
 
-The project has a new home!
+<!-- Here goes a general summary of what this release is about -->
 
-https://frequenz-floss.github.io/frequenz-channels-python/
+## Upgrading
 
-For now the documentation is pretty scarce but we will be improving it with
-time.
-
-## Upgrading (breaking changes)
-
-* You need to make sure to use [timezone-aware] `datetime` objects when using
-  the timestamp returned by [`Timer`], Otherwise you will get an exception.
-
-* Channels methods `get_receiver()` and `get_sender()` have been renamed to
-  `new_receiver()` and `new_sender()` respectively. This is to make it more
-  clear that new objects are being created.
-
-* The public API surface has been reduced considerably to make it more clear
-  where to import symbols.  You should update your imports.  The new symbol
-  locations are:
-
-  * `frequenz.channels.Anycast`
-  * `frequenz.channels.Broadcast`
-  * `frequenz.channels.Anycast`
-  * `frequenz.channels.Bidirectional`
-  * `frequenz.channels.Broadcast`
-  * `frequenz.channels.Peekable`
-  * `frequenz.channels.Receiver`
-  * `frequenz.channels.Sender`
-  * `frequenz.channels.util.Merge`
-  * `frequenz.channels.util.MergeNamed`
-  * `frequenz.channels.util.FileWatcher`
-  * `frequenz.channels.util.Select`
-  * `frequenz.channels.util.Timer`
-
-* The class `BufferedReceiver` was removed because the interface was really
-  intended for channel implementations. Users are not supposed to enqueue
-  messages to receiver but just receive from them. If you used it you can
-  implement it yourself.
-
-* The class `BidirectionalHandle` was moved to `Bidirectional.Handle`.
-
-* The class `EventType` was moved to `FileWatcher.EventType`.
+<!-- Here goes notes on how to upgrade from previous versions, including if there are any depractions and what they should be replaced with --> 
 
 ## New Features
 
-* Python 3.11 is now supported!
+<!-- Here goes the main new features and examples or instructions on how to use them -->
 
 ## Bug Fixes
 
-* [`Broadcast`] receivers now get cleaned up once they go out of scope.
-
-* [`Timer`] now returns [timezone-aware] `datetime` objects using UTC as
-  timezone.
-
-[`Broadcast`]: https://frequenz-floss.github.io/frequenz-channels-python/v0.11/reference/frequenz/channels/#frequenz.channels.Broadcast
-[`Timer`]: https://frequenz-floss.github.io/frequenz-channels-python/v0.11/reference/frequenz/channels/#frequenz.channels.Timer
-[timezone-aware]: https://docs.python.org/3/library/datetime.html#aware-and-naive-objects
+<!-- Here goes notable bug fixes that are worth a special mention or explanation -->