Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  156aa61313f3a848e1e232a5d8a87a17fef48786

Change rev_comment to rev_change_type

Also adjusts reference to "comments" to instead refer to "change types"
and updates the cache keys used for Summary(header) and post revision storage
to bust any caches containing the prior rev_comment data.

Change-Id: Ib0afc042f35677f2566a1f6a9223b9e89316a352