3.18.1  23-Oct-2015
        - Fix Gdk.rectangle_intersect/rectangle_union missing with GTK+ 3.18 (Christoph Reiter) (#756364)
        - pep8: ignore new errors reported by pep8 1.6 (Christoph Reiter)
        - Don't emit require_version warning if namespace was loaded previously using g_irepository_require (Christoph Reiter) (#754491)
        - configure.ac: post release version bump to 3.18.1 (Garrett Regier)

3.18.0  22-Sep-2015