Update metadata.yml with correct URL

Change-Id: I8227ee71a14c180c5717ad0e741bdc8ab406b188
diff --git a/metadata.yml b/metadata.yml
index 7de23ef..3a0353a 100644
--- a/metadata.yml
+++ b/metadata.yml
@@ -1,3 +1,3 @@
 name: "heka"
 version: "0.2"
-source: "https://github.com/tcpcloud/salt-formula-heka"
+source: "https://github.com/salt-formulas/salt-formula-heka"