Fixes #1630 Migration blocker issue resolved

modules/Migration/models/Module.php

@@ -45,6 +45,7 @@ class Migration_Module_Model extends Vtiger_Module_Model {
array('710' => '7.1.0'),
array('711' => '7.1.1'),
array('720' => '7.2.0'),
+                        array('73' => '7.3'),
array('730' => '7.3.0'),
array('740' => '7.4.0'),
);