Migrated to org.jung.ant-contrib

[stefan-jung]

Migrated org.doctales.ant-contrib to org.jung.ant-contrib.

[infotexture]

@stefan-jung Instead of deleting this file, you could replace the contents with an alias key, so that anyone looking for the old plug-in name org.doctales.ant-contrib would be redirected to the new plug-in:

{
  "alias": "org.jung.ant-contrib"
}

This feature isn't documented (yet), but you'll find examples in the registry repo, such as pdf2.json.

This approach can be useful in cases where there are previously published links to the old name in places that can't be easily updated.

Of course it's your choice whether you want the plug-ins to be found under the old name — but if you like the idea, you might want to do the same in #158 & #159, and/or any other previously renamed doctales plug-ins.