Links for dflydev.com in composer.json are dead

[bebehr]

When updating unsecure HTTP links in #52 to HTTPS, I noticed http://dflydev.com/ or https://dflydev.com/ does not work anymore.

Dragonfly Development Inc. homepage, which is referenced in composer.json answers with HTTP Status 404 gone.

Solution might be to either replace it or to delete it in composer.json