release notes

Author: mgravell

docs/ReleaseNotes.md

@@ -9,6 +9,8 @@ Current package versions:
 ## Unreleased
 No pending unreleased changes
 
+- Add support for sharded pub/sub via `RedisChannel.Sharded` - ([#2887 by vandyvilla, atakavci and mgravell](https://github.com/StackExchange/StackExchange.Redis/pull/2887))
+
 ## 2.8.37
 
 - Add `ConfigurationOptions.SetUserPemCertificate(...)` and `ConfigurationOptions.SetUserPfxCertificate(...)` methods to simplify using client certificates ([#2873 by mgravell](https://github.com/StackExchange/StackExchange.Redis/pull/2873))