README: Fix broken link

Author: orgads

README.md

@@ -1,6 +1,6 @@
 # Node.js
 
-[![dockeri.co](http://dockeri.co/image/_/node)](https://registry.hub.docker.com/_/node/)
+[![dockeri.co](https://dockerico.blankenship.io/image/node)](https://hub.docker.com/_/node)
 
 [![GitHub issues](https://img.shields.io/github/issues/nodejs/docker-node.svg "GitHub issues")](https://github.com/nodejs/docker-node)
 [![GitHub stars](https://img.shields.io/github/stars/nodejs/docker-node.svg "GitHub stars")](https://github.com/nodejs/docker-node)