gtk: Use httpS links
[package]
-documentation = "http://gtk-rs.org/docs/gtk/"
+documentation = "https://gtk-rs.org/docs/gtk/"
categories = ["api-bindings", "gui"]
license = "MIT"
description = "Rust bindings for the GTK+ 3 library"
name = "gtk"
-homepage = "http://gtk-rs.org/"
+homepage = "https://gtk-rs.org/"
authors = ["The Gtk-rs Project Developers"]
readme = "README.md"
version = "0.9.0"
