This version has been created due to a change on the package async-upnp-client, which on version 0.21.0 renamed the "UpnpAdvertisementListener" class to "SsdpAdvertisementListener", which of course prevented aioleviosa from working on new installs done in September 2021.
There is no functional change. The new Class name is a better fit for the intended usage, so aioLeviosa was updated accordingly to maintain compatibility