add stanza to changelog

CHANGELOG.md

@@ -2,14 +2,15 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
-## [0.2.0] Milestone 2 - 2015-08-19
+## [0.2.0] Milestone 2 - 2015-08-21
 ### Added
 - `StreamDecorator` abstract class used to make pipeline of streams,
 - `Connector` interface, used as abstraction for creating connection streams,
 - Dumping utility, that can be accessed via `\Kadet\Xmpp\helper\dd` function,
 - `XmppClient` class which acts like dependency injection container for modules,
 - `Authenticator` module interface,
 - `SaslAuthenticator` implementing interface mentioned above,
+- `Stanza` model class for handling stanzas
 
 ### Changed
 - `XmlFactory` now creates `XmlElement` instead of just returning class,