Update resizer README with latest image versions
Update resizer README with latest image versions

The 2.3 images are now available, update the readme to show this.

kubernetes/autoscaler,kubernetes/autoscaler,mmerrill3/autoscaler,mmerrill3/autoscaler,kubernetes/autoscaler,bskiba/autoscaler,bskiba/autoscaler,mmerrill3/autoscaler,kubernetes/autoscaler,bskiba/autoscaler,mmerrill3/autoscaler