Fix missing COPY, update.sh supported versions

Should we adjust the recommended place to put the conf file while we are fixing this line?  Volumes can get hairy, especially if they bind mount something and a "where did my file go?" comes up.  Kind of like https://github.com/nginxinc/docker-nginx/issues/5.
Nope, no HUP that I see: http://redis.io/topics/signals.

http://redis.io/topics/config says that you can reconfigure using CONFIG SET and CONFIG GET but that the change does not get written to the config file (a future addition).