Update changelog for 2.0.0-1 release

debian/changelog

+php-doctrine-event-manager (2.0.0-1) experimental; urgency=medium
+
+  * Upload new major to experimental
+
+  [ Alexander M. Turek ]
+  * Bump to PHP 8.1 and add types everywhere (#51)
+  * Revert return type on EventSubscriber::getSubscribedEvents() (#54)
+  * Made the $event parameter of EventManager::getListeners() mandatory (#57)
+  * Remove doctrine/deprecations (#59)
+
+  [ David Prévot ]
+  * Revert "Track version 1 for now (Bookworm?)"
+  * Drop php-doctrine-deprecations build-dependency
+
+ -- David Prévot <taffit@debian.org>  Sat, 15 Oct 2022 12:15:37 +0200
+
 php-doctrine-event-manager (1.2.0-1) unstable; urgency=medium
 
   [ Alexander M. Turek ]