removing RC4 URL

Author: arun-gupta

swarm-mode/beginner-tutorial/swarm-node-vbox-setup.sh

@@ -10,15 +10,15 @@ echo "======> Creating $managers manager machines ...";
 for node in $(seq 1 $managers);
 do
 	echo "======> Creating manager$node machine ...";
-	docker-machine create -d virtualbox --virtualbox-boot2docker-url "https://github.com/boot2docker/boot2docker/releases/download/v1.13.0-rc4/boot2docker.iso" manager$node;
+	docker-machine create -d virtualbox manager$node;
 done
 
 # create worker machines
 echo "======> Creating $workers worker machines ...";
 for node in $(seq 1 $workers);
 do
 	echo "======> Creating worker$node machine ...";
-	docker-machine create -d virtualbox --virtualbox-boot2docker-url "https://github.com/boot2docker/boot2docker/releases/download/v1.13.0-rc4/boot2docker.iso" worker$node;
+	docker-machine create -d virtualbox worker$node;
 done
 
 # list all machines
@@ -64,3 +64,4 @@ done
 
 # show members of swarm
 docker-machine ssh manager1 "docker node ls"
+