Declare spec 1.2 support?

[The-Compiler]

linux_notification_center (the 1.7.2 release binary) seems to advertise support for the 1.0 spec only:

$ dbus-send --session --print-reply --dest=org.freedesktop.Notifications /org/freedesktop/Notifications org.freedesktop.Notifications.GetServerInformation method return time=1616873197.040897 sender=:1.60612 -> destination=:1.60632 serial=46 reply_serial=2
   string "haskell-notification-daemon"
   string "abc"
   string "0.0.1"
   string "1.0"

The main difference between the spec versions (as far as I know) is the name of the image data hint. From what I can gather, haskell-notification-daemon seems to (fully?) implement the 1.2 spec, not only 1.0.