Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  1a0a7dfb99ea83c7b7e3efe37d64f535244b7af6

New topic notifications for watchers of a board.

Depends on Echo patch I19bb6a794d22565f3bb5421de92426d390197796
to implement the `user-locators` notifiction parameter

Change-Id: I4e46a9c003fbdde274b20ac7aef8455eab4a5222