==== Upgraded external libraries ====
* Updated jquery.chosen from v0.9.14 to v1.8.2.
* Updated composer/spdx-licenses from 1.1.4 to
- 1.2.0 (development dependency).
+ 1.3.0 (development dependency).
* Updated nikic/php-parser from 2.1.0 to 3.1.3
(development dependency).
* Updated wikimedia/ip-set from 1.1.0 to 1.2.0.
* The driver 'mysql' for MySQL, deprecated in MediaWiki 1.30, has been removed.
The driver has been deprecated since PHP 5.5 and was removed in PHP 7.0. The
default driver for MySQL has been 'mysqli' since MediaWiki 1.22.
+* The following properties of PreparedEdit were deprecated in 1.21 and have been removed:
+ * PreparedEdit->newText
+ * PreparedEdit->oldText
+ * PreparedEdit->pst
+* QuickTemplate::setRef() was deprecated in favour of QuickTemplate::set().
+ Setting template variables by reference allowed violating the principle of data being
+ immutable once added to the skin template. In practice, this method was not being
+ used for that. Rather, setRef() existed as memory optimisation for PHP 4.
== Compatibility ==
MediaWiki 1.31 requires PHP 5.5.9 or later. Although HHVM 3.18.5 or later is supported,