Composer file contained a trailing comma. Was not a problem before.

git-svn-id: https://humgenprojects.lumc.nl/svn/LOVD3/trunk@640 a7477d18-a37e-46de-aef1-57953c184492

composer.json

@@ -7,6 +7,6 @@
         "phpunit/phpunit-story": "*",
         "sebastian/comparator": "~1.0",
         "ext-curl": "*",
-        "ext-dom": "*",
+        "ext-dom": "*"
     }
 }