Update release notes

Author: cwasicki

RELEASE_NOTES.md

@@ -6,11 +6,11 @@
 
 ## Upgrading
 
-<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
+* Update delivery period time filter validation to remove inappropriate start time check.
 
 ## New Features
 
-<!-- Here goes the main new features and examples or instructions on how to use them -->
+* CLI: Support delivery time filter in gridpool streams.
 
 ## Bug Fixes