[maven-release-plugin] prepare release digitalocean-plugin-0.6
[maven-release-plugin] prepare release digitalocean-plugin-0.6

nurupo/digitalocean-plugin,nurupo/digitalocean-plugin,BlackPepperSoftware/digitalocean-plugin,jenkinsci/digitalocean-plugin,BlackPepperSoftware/digitalocean-plugin,jenkinsci/digitalocean-plugin