README: point to gdk4-macos instead of wayland

Author: nacho

gdk4-macos/README.md

@@ -27,7 +27,7 @@ If you want to track the bleeding edge, use the git dependency instead:
 
 ```toml
 [dependencies]
-gdk-wayland = { git = "https://github.com/gtk-rs/gtk4-rs.git", package = "gdk4-wayland" }
+gdk-macos = { git = "https://github.com/gtk-rs/gtk4-rs.git", package = "gdk4-macos" }
 ```
 
 Avoid mixing versioned and git crates like this: