Prepare changelog for 2.12.5
Release History
---------------
+2.12.5 (2017-01-18)
++++++++++++++++++++
+
+**Bugfixes**
+
+- Fixed an issue with JSON encoding detection, specifically detecting
+ big-endian UTF-32 with BOM.
+
2.12.4 (2016-12-14)
+++++++++++++++++++
