Update CHANGELOG.md

Author: marcuslinke

CHANGELOG.md

@@ -15,6 +15,7 @@ All changes
 * [#574] (https://github.com/docker-java/docker-java/pull/574) Fix for copyArchiveToContainerCmd bug
 * [#572] (https://github.com/docker-java/docker-java/pull/572) Inspect container command now shows sizes if requested 
 * [#563] (https://github.com/docker-java/docker-java/pull/563) Fix memory leak in netty implementation of DockerCmdExecFactory
+* [#550] (https://github.com/docker-java/docker-java/pull/550) Add ability to configure IPAM config for CreateNetworkCmd 
 
 Included in 3.0.0-RC5