Update release notes

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

Author: shsms

RELEASE_NOTES.md

@@ -10,7 +10,7 @@
 
 ## New Features
 
-<!-- Here goes the main new features and examples or instructions on how to use them -->
+- Added support for disabling the overflow-warning log messagess in broadcast receivers, through the `warn_on_overflow` parameter on `Broadcast.new_receiver()` calls.
 
 ## Bug Fixes