update years in docs
update years in docs

vjuranek/docker-maven-plugin,scoplin/docker-maven-plugin,fabric8io/docker-maven-plugin,fabric8io/docker-maven-plugin,vjuranek/docker-maven-plugin,fabric8io/docker-maven-plugin,rhuss/docker-maven-plugin,rhuss/docker-maven-plugin,vjuranek/docker-maven-plugin,thomasvandoren/docker-maven-plugin