fixed typo in Puppet file. missing comma

Puppetfile

@@ -15,7 +15,7 @@ metadata
 #mod 'puppet',
 #    :git => "git://github.com/puppetlabs/puppetlabs-puppet"
 mod 'ceph',
-    :git => "https://baltig.infn.it/ocp-tools/ceph.git"
+    :git => "https://baltig.infn.it/ocp-tools/ceph.git",
     :ref => '2.0.0'
 
 # A module from a git branch/tag
@@ -42,4 +42,4 @@ mod 'ocp-tools/mongodb',
 # Modulo Zabbix AutomaticOCP 
 mod 'ocp-tools/zabbix',
     :git => "https://baltig.infn.it/ocp-tools/zabbix.git",
-    :ref => '2.1.0'
\ No newline at end of file
+    :ref => '2.1.0'