Ansible: specify where I got this role from

I have no idea why Ansible started yelling at me today.

Change-Id: Ie5e17ec5b8892441fb8e551d1cc0acccb7dda343
diff --git a/requirements.yml b/requirements.yml
index 37e5863..4cc7730 100644
--- a/requirements.yml
+++ b/requirements.yml
@@ -6,5 +6,6 @@
   name: openstack.nodepool
   version: f2b60823ddfa61ebd320e219f66d0d03aa93e8a5
 
-- src: smbambling.scl
+- src: https://github.com/jktjkt/ansible-role-scl
+  name: smbambling.scl
   version: 7bef94aaf46d84ab1f646c03c112e8bca3112931