add missing url

update.sh

@@ -23,6 +23,7 @@ replace_field() {
 declare -A otherRepos=(
 	[aerospike]='https://github.com/aerospike/aerospike-server.docker'
 	[alpine]='https://github.com/gliderlabs/docker-alpine'
+	[arangodb]='https://github.com/arangodb/arangodb-docker'
 	[busybox]='https://github.com/jpetazzo/docker-busybox'
 	[centos]='https://github.com/CentOS/sig-cloud-instance-images'
 	[cirros]='https://github.com/ewindisch/docker-cirros'