Update changelog for 2.0.0-1 release

debian/changelog

+php-doctrine-annotations (2.0.0-1) experimental; urgency=medium
+
+  * Upload new major release to experimental
+
+  [ Grégoire Paris ]
+  * Drop Lexer 1
+  * Bump PHP to 7.2
+  * Allow doctrine/lexer 3
+
+  [ David Prévot ]
+  * Revert "Track version 1 for now (Bookworm?)"
+  * Install upstream upgrade instructions
+  * Build-depend on recent php-doctrine-lexer
+
+ -- David Prévot <taffit@debian.org>  Wed, 21 Dec 2022 07:24:50 +0100
+
 php-doctrine-annotations (1.14.2-1) unstable; urgency=medium
 
   [ Grégoire Paris ]