[FrameworkBundle] move change note to changelog of FrameworkBundle instead of master UPGRADE-2.2

Author: dbu

CHANGELOG.md

@@ -7,6 +7,9 @@ CHANGELOG
  * replaced Symfony\Bundle\FrameworkBundle\Controller\TraceableControllerResolver by Symfony\Component\HttpKernel\Controller\TraceableControllerResolver
  * replaced Symfony\Component\HttpKernel\Debug\ContainerAwareTraceableEventDispatcher by Symfony\Component\HttpKernel\Debug\TraceableEventDispatcher
  * added Client::enableProfiler()
+ * A new parameter has been added to the DIC: `router.request_context.base_url`
+   You can customize it for your functional tests or for generating urls with
+   the right base url when your are in the cli context.
 
 2.1.0
 -----