Update RELEASE_NOTES.md for 0.11.0 release (#237)

* Update RELEASE_NOTES.md for 0.11.0 release

* Update RELEASE_NOTES.md

Author: Arkatufus

RELEASE_NOTES.md

@@ -1,3 +1,16 @@
+### 0.11.0 July 8 2021 ####
+* [Fix array of user defined structs serialization failure](https://github.com/akkadotnet/Hyperion/pull/235)
+* [Remove dynamic keyword usage from array serializer](https://github.com/akkadotnet/Hyperion/pull/139)
+* [Change field ordering to ordinal](https://github.com/akkadotnet/Hyperion/pull/236)
+
+**Possible breaking changes**
+
+The change to the object serializer field ordering might cause a deserialization failure of persisted objects
+that are serialized using the Hyperion serializer.
+
+Please report any serialization problem that occurs after an upgrade to this version at the
+[issue tracker](https://github.com/akkadotnet/Hyperion/issues)
+
 ### 0.10.2 June 30 2021 ####
 * [Update Akka version to 1.4.21](https://github.com/akkadotnet/akka.net/releases/tag/1.4.21)
 * [Add exception rethrow to help with debugging](https://github.com/akkadotnet/Hyperion/pull/229)