Added v0.5.0 release notes (#117)

Author: Aaronontheweb

RELEASE_NOTES.md

@@ -1,2 +1,3 @@
-#### 0.4.0 March 12 2020 ####
-* Upgraded to [Akka.NET v1.4.1](https://getakka.net/community/whats-new/akkadotnet-v1.4.html)
+#### 0.5.0 December 30 2020 ####
+* Upgraded to [Akka.NET v1.4.14](https://github.com/akkadotnet/akka.net/releases/tag/1.4.14)
+* [Print seed nodes when bootstrapping from environment variables as array](https://github.com/petabridge/akkadotnet-bootstrap/issues/104)