[doc] Update changes title, 3.27 is now released

--HG-- branch : 3.27

[doc] Update changes title, 3.27 is now released
--HG-- branch : 3.27
f58032c7 · Simon Chabot · 160ad9b65eac · e434d8f4
Commit f58032c7 authored Jan 31, 2020 by Simon Chabot
--- a/doc/changes/3.27.rst
+++ b/doc/changes/3.27.rst
-3.27 (not yet released)
-=======================
+3.27
+====

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