We should validate that the version in the pubspec and the latest version in the CHANGELOG match any time there's an update to either file. Currently we're only checking if the pubspec changes. See flutter/plugins#3654 for an example of an issue that would have been caught by that. (There was a related issues recently where a conflict resolution was done incorrectly and a change was checked in that regressed the version and added a new, older version entry under the latest entry in the CHANGELOG).