Update README for project move.

* README: Correct clone URL.

Change-Id: If7f790d2a9352476fc634eba5784406e6cec43bb
Reviewed-on: https://review.openstack.org/18201
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins
diff --git a/README b/README
index 2916781..b28c5b9 100644
--- a/README
+++ b/README
@@ -4,7 +4,7 @@
 
 ## Contributing
 
-To get the latest code, see: https://github.com/openstack-ci/zuul
+To get the latest code, see: https://github.com/openstack-infra/zuul
 
 Bugs are handled at: https://launchpad.net/zuul