Update release notes

Signed-off-by: Sahas Subramanian <[email protected]>

Author: shsms

RELEASE_NOTES.md

@@ -6,7 +6,7 @@
 
 ## Upgrading
 
-<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
+- Use the `Receiver.is_selected` method instead of `selected_from`.  `selected_from` is deprecated, and will be removed in v2.
 
 ## New Features