Now is the time to help #test darktable!

From our maintainer, Pascal:

> There was some fixes done to support Wayland. At this point we feel that Darktable is usable under Wayland.

> If you still are using X11 you can test the following points to ensure there is no regressions introduced

More info: https://discuss.pixls.us/t/testing-darktable-youre-not-a-dev-but-you-can-help/53006/23?u=paperdigits