Adds CHANGELOG entry for #23

Author: weierophinney

CHANGELOG.md

@@ -2,15 +2,16 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
-## 2.6.1 - TBD
+## 2.6.1 - 2018-04-30
 
 ### Added
 
 - Nothing.
 
 ### Changed
 
-- Nothing.
+- [#23](https://github.com/zendframework/zend-uri/pull/23) updates the zend-validator dependency to the 2.10 series, in order to ensure that
+  this package can run under PHP 7.2.
 
 ### Deprecated