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User visible changes for gotk3
  Go bindings for GTK3
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Changes for next Version 0.6.0
 - Breaking changes in API
 - General code cleanup 
 - #685  Refactor Gtk callback setters and types enhancement missing binding
 - #706 Refactor internal closure handling and several API changes breaking changes
 - #746 Add build tag pango_1_42 for Pango
 - #743 Solving #741- Add possibility to use GVariant in signal handler
 - #740 Add binding for GtkRadioMenuItem
 - #738 Adds binding for gtk_cell_layout_clear_attributes()
 - #737 Adds bindings for gdk_pixbuf_new_from_resource() and gdk_pixbuf_new_from_resource_at_scale()
 - #736 Add bindings/helper methods GdkRectangle GdkPoint
 - #735 Add GtkMenuItem bindings
 - #734 Add bindings GtkMenuShell
 - #732 add as contributor
 - #731 add bindings to GtkMenu
 - #730 Solve GtkAccelKey issue with golang 1.16
 - #728 It is not safe to reference memory returned in a signal callback.
 - #687 Don't merge until publication of Golang v1.16: GtkAccelKey v1.16 issue fix next version
 - #724 Implemented CellRenderer.SetAlignment
 - #723 Added SetOrientation to gkt.SpinButton
 - #720 Add Prgname getter and setter
 - #716 Add (Get/Set) methods to GdkRGBA & GdkVisual & GdkDisplayManager bind…
 - #715 Add some GtkRange bindings
 - #712 glib.Take to return nil and gtk.marshal* to allow nil
