Update CHANGELOG.md

CHANGELOG.md

@@ -5,6 +5,7 @@ For instructions on how to upgrade from one version to another, please see the d
 ??? (???)
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 - [BC Break] Passes DeserializationContext to ObjectConstructor instances as additional argument
+- adds a handler for Propel related classes
 
 0.13 (2013-07-29)
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