Update README badge

Author: fabiang

README.md

@@ -2,7 +2,7 @@
 
 Sqlcmd – command line tool for Microsoft SQL Server.
 
-[![fabiang/sqlcmd](http://dockeri.co/image/fabiang/sqlcmd)](https://registry.hub.docker.com/u/fabiang/sqlcmd/)
+[![fabiang/sqlcmd](https://img.shields.io/docker/pulls/fabiang/sqlcmd.svg)](https://registry.hub.docker.com/r/fabiang/sqlcmd)
 
 ## Available tags