Add changelog for 445
This MR was automatically created from CI, https://gitlab.com/gitlab-org/gitter/gitter-android-app/-/jobs/490268241
We copied CURRENT_VERSION.txt
-> 445.txt
This MR was automatically created from CI, https://gitlab.com/gitlab-org/gitter/gitter-android-app/-/jobs/490268241
We copied CURRENT_VERSION.txt
-> 445.txt