Update revision history

Author: pdimov

doc/smart_ptr/changelog.adoc

@@ -1,5 +1,5 @@
 ////
-Copyright 2019, 2020 Peter Dimov
+Copyright 2019-2025 Peter Dimov
 
 Distributed under the Boost Software License, Version 1.0.
 
@@ -13,6 +13,10 @@ http://www.boost.org/LICENSE_1_0.txt
 :toc-title:
 :idprefix: changelog_
 
+## Changes in 1.88.0
+
+* Fix `operator<<` for wide streams (accidentally broken in 1.87.0)
+
 ## Changes in 1.87.0
 
 * {cpp}03 is no longer supported, a {cpp}11 compiler is required.