Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  362e784f3e75ac3f7252d80c114cec96f19acd40

Move ChangeHandler and friends to new namespace.

This introduces the Wikibase\Client\Changes namespace

Change-Id: I7ef4c2004825c54e2f22c2326eae4096f9f8955a