[concat] add dependency.

Author: truthbk

metadata.json

@@ -75,6 +75,10 @@
     {
       "name": "lwf/remote_file",
       "version_requirement": ">=1.1.3"
+    },
+    {
+      "name": "puppetlabs/ruby",
+      "version_requirement": ">=1.1.0"
     }
   ]
 }