Add changelog for 422
This MR was automatically created from CI, https://gitlab.com/gitlab-org/gitter/gitter-android-app/-/jobs/486468173
We copied CURRENT_VERSION.txt
-> 422.txt
This MR was automatically created from CI, https://gitlab.com/gitlab-org/gitter/gitter-android-app/-/jobs/486468173
We copied CURRENT_VERSION.txt
-> 422.txt