Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  9a2f86d47474d8be96e3fdb566a660ecfdb21e8d

Implement post history

Link like the following would throw exception:

https://www.mediawiki.org/w/index.php?title=Topic:S1jkmjn3hg6w6mkn&action=history&topic_postId=s1lpteic8yh7s1ds

Change-Id: Idb6e83ba97259ad9a4cd912fc983c617b19a78e3