README: Update available backends | Initial work towards Gtk4.

README.md

@@ -15,16 +15,13 @@ for multiple purposes such as games, app development, simple UI boxes for termin
 
 # Backends
 - **Adwaita Backend**\
-A backend using `libadwaita` and Gtk4. Currently unsupported because it requires Gtk4 (see the Gtk3 backend below for more).\
+A backend using Gtk4 and `libadwaita`. Currently experimental, however it is expected to be ported to stable by 0.2.0. Also note, this backend makes use of hardware acceleration, which sometimes breaks games in Wayland.
 
 - **Gtk3 Backend**\
 Some older distributions do not have Adwaita / Gtk4 support yet. The Gtk3 backend can be used in such a situation. However Gtk3 is considered to be deprecated and will be replaced with `libadwaita` later in the library.
 
 - **Win32 Backend**\
-Windows-specific backend, used only for Windows compatibility.
-
-- **Fallback Backend**\
-This backend is only used if everything else fails. It outputs an error message to the console.
+Windows-specific backend, used only for Windows compatibility. This backend is mainly tested on GNU/Linux with `wine`, and so some bugs may not be detected. Open an issue if that's the case.
 
 # Example
 This is a simple cross-platform example of a simple message box greeting the user: