Update CHANGELOG.md
Update CHANGELOG.md

Co-authored-by: Gareth Thackeray <f80407e727cd07a83fc6719778adf8e0c5ba76c9@smartbear.com>
bugsnag/bugsnag-unity,bugsnag/bugsnag-unity,bugsnag/bugsnag-unity,bugsnag/bugsnag-unity,bugsnag/bugsnag-unity,bugsnag/bugsnag-unity