Some release notes for 3.14
Change gdk-pixbuf minimum required version to 2.30.0

https://bugzilla.gnome.org/show_bug.cgi?id=735253

Signed-off-by: Ikey Doherty <michael.i.doherty@intel.com>
GtkAboutDialog: Drop visibility-notify-event handler

The signal is deprecated, and the handler is only helping
for a really tiny corner case anyway.

https://bugzilla.gnome.org/show_bug.cgi?id=734961