Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  577b4c1e25a54e55ba05366c6b3a7d128e8264a0

Remove redundant params

NotificationController::notifyPostChange will fetch content from the
revision that's tossed in already.

Meanwhile also removed obsolete $events init.

Change-Id: Ibf70e5e0cf5c1b9a16ef6b9cf7320218c75b61d7