Added CHANGELOG for #19 and #21

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.
 
-## 3.0.0 - TBD
+## 2.6.0 - 2016-02-04
 
 ### Added
 
@@ -18,5 +18,8 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Fixed
 
-- [#15](https://github.com/zendframework/zend-filter/pull/15) updates the
-  component to use the v3 versions of zend-servicemanager and zend-crypt.
+- [#15](https://github.com/zendframework/zend-filter/pull/15),
+  [#19](https://github.com/zendframework/zend-filter/pull/19), and
+  [#21](https://github.com/zendframework/zend-filter/pull/21)
+  update the component to be forwards-compatible with zend-servicemanager v3,
+  and reduce the number of development dependencies required for testing.