Added CHANGELOG for #180

Author: weierophinney

CHANGELOG.md

@@ -6,7 +6,16 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Added
 
-- Nothing.
+- [#180](https://github.com/zendframework/zend-servicemanager/pull/180) adds
+  explicit support for PSR-11 (ContainerInterface) by requiring
+  container-interop at a minimum version of 1.2.0, and adding a requirement on
+  psr/container 1.0. `Zend\ServiceManager\ServiceLocatorInterface` now
+  explicitly extends the `ContainerInterface` from both projects.
+  
+  Factory interfaces still typehint against the container-interop variant, as
+  changing the typehint would break backwards compatibility. Users can
+  duck-type most of these interfaces, however, by creating callables or
+  invokables that typehint against psr/container instead.
 
 ### Deprecated