[maven-release-plugin] prepare release zendesk-java-client-0.5.3
[maven-release-plugin] prepare release zendesk-java-client-0.5.3

cloudbees/zendesk-java-client,norrisjeremy/zendesk-java-client,christ66/zendesk-java-client,gvh1234/zendesk-java-client,matthewtckr/zendesk-java-client