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+# Upgrade to 2.0
+
+## Made the `$event` parameter of `EventManager::getListeners()` mandatory
+
+When calling `EventManager::getListeners()` you need to specify the event that
+you want to fetch the listeners for. Call `getAllListeners()` instead if you
+want to access the listeners of all events.
+
+# Upgrade to 1.2
+
+## Deprecated calling `EventManager::getListeners()` without an event name
+
+When calling `EventManager::getListeners()` without an event name, all
+listeners were returned, keyed by event name. A new method `getAllListeners()`
+has been added to provide this functionality. It should be used instead.