Merge pull request #1146 from jim4067/gtk-fix

fix: Gtihub link leads to an archived repository of the depreceated GTK binding. Updated it to new-ish gtk3 binding

README.md

@@ -1147,7 +1147,7 @@ See also [Are we game yet?](https://arewegameyet.rs)
   * [flutter-rs](https://github.com/flutter-rs/flutter-rs) — Build flutter desktop app in dart & rust.
 * [fschutt/azul](https://github.com/fschutt/azul) — A free, functional, IMGUI-oriented GUI framework for rapid development of desktop applications written in Rust, supported by the Mozilla WebRender rendering engine. [![build badge](https://api.travis-ci.org/fschutt/azul.svg?branch=master)](https://travis-ci.org/fschutt/azul)
 * [GTK+](https://www.gtk.org/) [[gtk](https://crates.io/keywords/gtk)]
-  * [gtk-rs/gtk](https://github.com/gtk-rs/gtk) — GTK+ bindings [![build badge](https://api.travis-ci.org/gtk-rs/gtk.svg?branch=master)](https://travis-ci.org/gtk-rs/gtk)
+  * [gtk-rs/gtk3-rs](https://github.com/gtk-rs/gtk3-rs) - GTK3 binding for rust ![CI](https://github.com/gtk-rs/gtk3-rs/workflows/CI/badge.svg)
   * [relm](https://github.com/antoyo/relm) — Asynchronous, GTK+-based, GUI library, inspired by Elm [![build badge](https://api.travis-ci.org/antoyo/relm.svg?branch=master)](https://travis-ci.org/antoyo/relm)
 * [hecrj/iced](https://github.com/hecrj/iced) — A cross-platform GUI library for Rust focused on simplicity and type-safety. Inspired by Elm.
 * [ImGui](https://github.com/ocornut/imgui)