Add changelog for 253
This MR was automatically created from CI, https://gitlab.com/gitlab-org/gitter/gitter-android-app/-/jobs/137393332
We copied CURRENT_VERSION.txt
-> 253.txt
This MR was automatically created from CI, https://gitlab.com/gitlab-org/gitter/gitter-android-app/-/jobs/137393332
We copied CURRENT_VERSION.txt
-> 253.txt