/usr/share/doc/qtdeclarative5-qtcontacts-plugin/changelog.Debian.gz is in qtdeclarative5-qtcontacts-plugin 5.0~git20140515~29475884-0ubuntu24~7.
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It is a symlink to /usr/share/doc/qtdeclarative5-qtcontacts-plugin/../qml-module-qtcontacts/changelog.Debian.gz