Add #1710 to release notes

Nick Craver · Nick Craver · commit 5324b15881f6 · 2021-06-26T23:40:28.000-04:00
diff --git a/docs/ReleaseNotes.md b/docs/ReleaseNotes.md
@@ -1,5 +1,9 @@
 # Release Notes
 
+## Unreleased
+
+- Sentinel potential memory leak fix in OnManagedConnectionFailed handler (#1710 via alexSatov)
+
 ## 2.2.50
 
 - performance optimization for PING accuracy (#1714 via eduardobr)
