updated nodesdk image name in docker-compose

nodesdk image in docker-compose file is referring to fabric-node-sdk but
actual image name in dockerhub is referring to fabric-starter-kit
with latest and x86_64-0.6.1-preview tags.

Change-Id: Ie798541ca458abf56d9e9e854e0c2292ce8e2d1a
Signed-off-by: rameshthoomu <rameshbabu.thoomu@gmail.com>

examples/sdk/node/docker-compose.yml

@@ -28,8 +28,8 @@ peer:
     - membersrvc
 
 nodesdk:
-  container_name: nodesdk
-  image: hyperledger/fabric-node-sdk
+  container_name: starter-kit
+  image: hyperledger/fabric-starter-kit
   volumes:
     - ~/mytest:/user/mytest
   environment: