Update README to upcoming version 0.7.0
Update README to upcoming version 0.7.0

mbologna/salt-netapi-client,SUSE/saltstack-netapi-client-java,mbologna/salt-netapi-client,SUSE/saltstack-netapi-client-java,SUSE/salt-netapi-client,mbologna/saltstack-netapi-client-java,mbologna/saltstack-netapi-client-java