Updated mediawiki/extensions
Project: mediawiki/extensions/MassMessage  bdb3ae294a6adcc4c075c118788c0839a3726e9c

Add Flow support

Implements basic functionality, with some issues:
* Topic titles are not wikitext, so preview is misleading
* New posts are not marked as bot in RecentChanges
* Double signature (LQT also has this issue)

Bug: 71082
Change-Id: I7b27cca71111c23ed7fa3796288602a50720240c