Updated the changelog

Author: stof

Changelog.md

@@ -4,6 +4,7 @@ Changelog
 ### 2.0.0 (2014-XX-XX)
 
 * The minimum requirement for Symfony has been bumped to 2.3 (older versions are already EOLed).
+* [BC break] ``UserInterface::isUser`` has been removed as it was used only by the old validation logic removed a long time ago.
 * [BC break] The ``FOSUserBundle:Security:login.html.twig`` template now receives an AuthenticationException in the ``error``
   variable rather than an error message.