update "docker daemon" deprecation message for new version scheme

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cmd/docker/daemon_unix.go

@@ -24,7 +24,7 @@ func newDaemonCommand() *cobra.Command {
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return runDaemon()
 		},
-		Deprecated: "and will be removed in Docker 1.16. Please run `dockerd` directly.",
+		Deprecated: "and will be removed in Docker 17.12. Please run `dockerd` directly.",
 	}
 	cmd.SetHelpFunc(helpFunc)
 	return cmd