[doc] Set release date of 3.25 in changelog

--HG-- branch : 3.25

[doc] Set release date of 3.25 in changelog
--HG-- branch : 3.25
3ecefe03 · Denis Laxalde · 127f7da447a4 · a33c2b8d
Commit 3ecefe03 authored Apr 19, 2017 by Denis Laxalde
--- a/doc/changes/3.25.rst
+++ b/doc/changes/3.25.rst
-3.25 (UNRELEASED)
-=================
+3.25 (14 April 2017)
+====================

 New features
 ------------