Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  4827071d64f24c0b1680eefec38e53bfc57ae3a8
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(minor) add wb.Snak.equal()

Allows to check whether one Snak is equal to another. Compares the Snak's type and property
ID. In case of PropertyValueSnak, also the value will be compared. Added tests for checking
equality for Snaks constructed from JSON to their JSON donors.

Change-Id: I4ba67322564b1a30968f0f1181721d56b0fe599a