Add swarm to update.sh

Signed-off-by: Andrea Luzzardi <[email protected]>

update.sh

@@ -49,6 +49,7 @@ declare -A otherRepos=(
 	[r-base]='https://github.com/rocker-org/rocker'
 	[registry]='https://github.com/docker/docker-registry'
 	[rethinkdb]='https://github.com/stuartpb/rethinkdb-dockerfiles'
+	[swarm]='https://github.com/docker/swarm-library-image'
 	[thrift]='https://github.com/ahawkins/docker-thrift'
 	[ubuntu-debootstrap]='https://github.com/tianon/docker-brew-ubuntu-debootstrap'
 	[ubuntu-upstart]='https://github.com/tianon/dockerfiles'