Update metadata.yml with correct URL

Change-Id: Id4794f7fc25a39ce60ea4ead4624f0f760924bf1
diff --git a/metadata.yml b/metadata.yml
index 006ac81..3809831 100644
--- a/metadata.yml
+++ b/metadata.yml
@@ -1,3 +1,3 @@
 name: "aptly"
 version: "2017.2"
-source: "https://github.com/tcpcloud/salt-formula-aptly"
+source: "https://github.com/salt-formulas/salt-formula-aptly"