Support for MUC

[julienmalik]

Just wanted to let you know that I implemented a similar redmine plugin for sending notifications in MUC rooms, heavily based on your code.

It is available here : https://github.com/YunoHost/redmine_xmpp_muc_notifications
Under the same license terms, of course.

Not really a fork since the functionnality is different. No db change, no user specific settings. It depends on xmpp4r (not the simple version), since it provides a MUC client.

Anyway, if there is a way to merge both, why not ?

[msva]

Wouldn't you consider to make a PR? 😎