Update RELEASE_NOTES.md for 1.5.15 release (#398)

Arkatufus · web-flow · commit cf03697d3744 · 2024-01-11T18:21:08.000Z
diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
@@ -1,3 +1,7 @@
+#### 1.5.15 January 11 2024 ####
+
+* [Upgraded to Akka.NET v1.5.15](https://github.com/akkadotnet/akka.net/releases/tag/1.5.15)
+
 #### 1.5.13.1 October 4 2023 ####
 
 * Publish NuGet package symbol file
