GNOME Mahjongg 3.31.3
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* Development release
* Switch from autotools to meson (Robert A.)
* Follow GNOME 3.32 app menu recommendations (Robert A.)
* Add Keyboard Shortcuts overlay (Jeremy)
* Hide Keyboard Shortcuts section in app help (Jeremy)
* Add Flatpak manifest (Jiri)
* Stop using intltool (Robert R.)
* Miscellaneous improvements (Anders, Andre, Carlos, Piotr)

Contributors:
 Robert Ancell, Jeremy Bicha, Piotr Drąg, Jiri Eischmann,
 Anders Jonsson, Andre Klapper, Robert Roth, Carlos Soriano