Use gio 2.40
@@ -17,7 +17,7 @@ clap = "2.31"
env_logger = "0.5.9"
failure = "0.1"
gdk = "0.8"
-gio = "0.4"
+gio = {version = "0.4", features = ["v2_40"] }
glib = "0.5"
glib-sys = { version = "0.6", features = ["v2_36"] }
gobject-sys = "0.6"
