Fix container image reference in README

Fix the used container image in the README example.

README.md

@@ -42,7 +42,7 @@ requests that should never happen.
             --name dockerproxy \
             -v /var/run/docker.sock:/var/run/docker.sock \
             -p 127.0.0.1:2375:2375 \
-            tecnativa/docker-socket-proxy
+            quay.io/sheogorath/docker-socket-proxy
 
 2.  Connect your local docker client to that socket: