[eclipse-iceoryx#4] Add contributors to 0.4 release notes

Author: orecham

doc/release-notes/iceoryx2-unreleased.md

@@ -456,3 +456,9 @@
     let node = NodeBuilder::new().create::<ipc::Service>()?;
     let node = NodeBuilder::new().create::<local::Service>()?;
     ```
+
+## Thanks To All Contributors Of This Version
+
+* [Christian »elfenpiff« Eltzschig](https://github.com/elfenpiff)
+* [Mathias »elBoberido« Kraus](https://github.com/elboberido)
+* [»orecham«](https://github.com/orecham)