* Added pp_sortkey column to page_props table, so pages can be efficiently
queried and sorted by property value (bug 58032).
See $wgPagePropsHaveSortkey if you want to postpone the schema change.
+* BREAKING CHANGE: The Modern and Cologne Blue skins were moved out of MediaWiki
+ core to their own respective repositories. See also
+ https://www.mediawiki.org/wiki/Skin:Modern and
+ https://www.mediawiki.org/wiki/Skin:CologneBlue.
==== Renamed classes ====
* CLDRPluralRuleConverter_Expression to CLDRPluralRuleConverterExpression