I would rename it to CHANGELOG for consistency with the other files ANNOUNCE, AUTHORS, COPYING, LICENSE, INSTALL, README, etc...
Well, the convention is for change logs to be called "ChangeLog" and for them to have a fairly specific format. (Wine used to have one; it was dropped a while ago in commit 84e8f7944be5bb53c8b5f1ff93cadcd0bba2acfe.)