ref(README): update deis graphic link

Author: Matthew Fisher

README.md

@@ -3,7 +3,7 @@
 
 Deis (pronounced DAY-iss) Workflow is an open source Platform as a Service (PaaS) that adds a developer-friendly layer to any [Kubernetes](http://kubernetes.io) cluster, making it easy to deploy and manage applications on your own servers.
 
-![Deis Graphic](https://s3-us-west-2.amazonaws.com/get-deis/deis-graphic-small.png)
+![Deis Graphic](https://getdeis.blob.core.windows.net/get-deis/deis-graphic-small.png)
 
 A NSQ image for running on a kubernetes cluster.