Update changelog and upload to unstable

debian/changelog

+mariadb-10.1 (10.1.20-3) unstable; urgency=low
+
+  [ Vicențiu Ciorbaru ]
+  * Update debian rules to also account for mipsel
+
+ -- Otto Kekäläinen <otto@debian.org>  Sat, 24 Dec 2016 20:23:23 +0200
+
 mariadb-10.1 (10.1.20-2) unstable; urgency=low
 
   [ Otto Kekäläinen ]