Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  990c68efdf7fabdb110845c038c992a0a9ce1601

Topic creator should be notified on post reply/edit/moderation

depends on Echo patch: https://gerrit.wikimedia.org/r/#/c/87277/

Change-Id: Ife2e63855a334d031b3b94191fd22b0c7bd9c4c9