Log Message:
materia-gtk-theme: Update to 20191017

Changes in v20191017:
    Follow the upstream GNOME 3.34.1 changes
    Fix broken header bar in gnome-tweaks 3.34
    Other various minor fixes and improvements

Changes in v20190912:
    Add support for GNOME Shell 3.34
    Fix popup menu shadow cutoff in gnome-shell >= 3.32
    Other minor fixes