Updated mediawiki/extensions
Project: mediawiki/extensions/Validator  e9979d0d9e5f44061a78c62e71bcdc38b56450ae
null
mention DataValues has a requirement in INSTALL

The Validator test suite require DataValues, so I am assuming the
extension requires it too.  This patch update the INSTALL file to
mention DataValues has a requirement.

Change-Id: Id9fa1ad5709ec4195b1a9b56b214c32458fddae1