Merge pull request #487 from voxpupuli/cleanup_fixtures

chore: cleanup .fixtures.yml

Author: TheMeier

.fixtures.yml

@@ -1,4 +1,5 @@
+---
 fixtures:
   repositories:
-    stdlib: "https://github.com/puppetlabs/puppetlabs-stdlib"
-    concat: "https://github.com/puppetlabs/puppetlabs-concat"
+    concat: https://github.com/puppetlabs/puppetlabs-concat
+    stdlib: https://github.com/puppetlabs/puppetlabs-stdlib