[gtksourceviewmm] Created tag 3.91.1

[Murray Cumming <murrayc src gnome org>]

The unsigned tag '3.91.1' was created.

Tagger: Murray Cumming <murrayc murrayc com>
Date: 1543933931 +0100

    3.91.1

Changes since the last tag '3.21.3':

Kip Warner (1):
      StyleSchemeChooserWidget: Correct the underlying GType name.

Murray Cumming (17):
      tests: Use the libsigc++-3.0 syntax.
      tests: Avoid deprecated Gtk::HBox and Gtk::VBox.
      Change ABI from gtksourceviewmm-3.0 to gtksourceviewmm-4.0.
      Use gtksourceview-4 instead of gtksourceview-3.0.
      Regenerate enums .defs.
      Regenerate methods .defs.
      Completion: Remove get/set_draw_spaces().
      Remove deprecated API.
      configure.ac: Don't try to get m4 conversions from cairomm.
      tests: Remove Gtk::Container::show_all() calls.
      Completion: show(): Rename to start().
      Regenerate .defs
      Adapt to changed gtksourceview function names
      Regenerated _docs.xml file
      Add m4 ustring conversions to fix the build.
      Build: Don't disable deprecated Pango API
      3.91.1