mod_conversejs: Reduce mod_bookmarks dependency to a warning
The luarocks dependency removed because the plugin installer is only
available in trunk, which now has mod_bookmarks available
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summary: 'Anonymous unique occupant identifiers for MUCs'
...
Introduction
============
This module implements [XEP-0421: Anonymous unique occupant identifiers for
MUCs](https://xmpp.org/extensions/xep-0421.html).
TODO
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- Subject messages
Compatibility
=============
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trunk Works
0.11 Works; except in MUC-PMs
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