Added CHANGELOG for #70

Author: weierophinney

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
-## 2.6.0 - TBD
+## 2.6.0 - 2016-02-18
 
 ### Added
 
@@ -24,6 +24,8 @@ All notable changes to this project will be documented in this file, in reverse
   `ContainerInterface` instead of extending from `AbstractPluginManager`.
   Usage remains the same, though developers who were adding services
   to the plugin manager will need to instead extend it now.
+- [#70](https://github.com/zendframework/zend-mail/pull/70) updates dependencies
+  to stable, forwards-compatible versions, and removes unused dependencies.
 
 ## 2.5.3 - TBD