Edit queue-worker image with openfaas ns

After editing queue-worker to push do openfaas/ ns instead of
functions/ this chage is required to match the image name.
Set to latest version 0.4.8

Signed-off-by: Ivana Yovcheva (VMware) <[email protected]>

Author: ivanayov

docker-compose.yml

@@ -86,7 +86,7 @@ services:
                     - 'node.platform.os == linux'
 
     queue-worker:
-        image: functions/queue-worker:0.4.6
+        image: openfaas/queue-worker:0.4.8
         networks:
             - functions
         environment: