==== Upgraded external libraries ====
* Updated oojs/oojs-ui from v0.12.12 to v0.13.3.
* Updated composer/semver from v1.0.0 to v1.2.0.
+* Update liuggio/statsd-php-client to 1.0.18.
==== New external libraries ====
* Added wikimedia/base-convert v1.0.1.