Update changelog for 1:10.3.11-1~exp2 release

debian/changelog

-mariadb-10.3 (1:10.3.11-1~exp2) UNRELEASED; urgency=low
-
-  * Open new entry
-
- -- Otto Kekäläinen <otto@debian.org>  Sun, 16 Dec 2018 17:13:15 +0200
+mariadb-10.3 (1:10.3.11-1~exp2) experimental; urgency=low
+
+  * Partially revert c034491: Debian and Docker builds don't support --mem
+  * Update SSL/TLS keys as OpenSSL since 1.1.0 rejects weak keys by default
+  * Remove innodb_* options from server config that are default in 10.3
+  * Remove --skip-auth-anonymous-user deprecated in 10.3
+  * Include also arch specific skiplists in CI tests
+  * Make TokuDB explicitly depend on libjemalloc1
+  * Lintian fix: remove unnecessary Priority: optional definition
+  * Follow Salsa-CI changes and update build image name to 'dockerbuilder'
+  * Rename gitlab-ci.yml following the Salsa CI example
+  * Extend gitlab-ci to test installation and upgrade of MariaDB
+
+ -- Otto Kekäläinen <otto@debian.org>  Tue, 18 Dec 2018 09:32:58 +0200
 
 mariadb-10.3 (1:10.3.11-1~exp1) experimental; urgency=low