Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  8c9995d2dd9339bc0f3130e006246878ab26e6a3
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(bug 42993) dispatcher script for change propagation.

This is to replace the old pollForChanges script.

Change-Id: I5165f2a6bdfa147da9a5ad53cb5bd2ec1f54826e