Add Title when using REGISTRY_URL (feature request)

[@soosap]

Hi I have tested the app using the fix suggested by #27. First of all, I can confirm that the PR solves the problem.

Yet another small issue arises when using REGISTRY_URL: No title is being set.

Would it be possible to pass a custom name via an optional environment variable i.e. REGISTRY_TITLE?

Thanks for considering :)

[Jones Magloire]

Done in #32 (v0.3.4)
Use REGISTRY_TITLE to set your custom title 😄
Thanks again ;)