[glibmm] Created tag 2.54.1

[Kjell Ahlstedt <kjellahl src gnome org>]

The unsigned tag '2.54.1' was created.

Tagger: Kjell Ahlstedt <kjellahlstedt gmail com>
Date: Mon Sep 18 20:06:34 2017 +0200

    2.54.1

Changes since the last tag '2.54.0':

Kjell Ahlstedt (4):
      Gio::Application docs: Add a note to property_resource_base_path()
      gmmproc: Convert all property documentation to C++
      Glib::Variant<std::tuple>: Don't use std::index_sequence from C++14
      2.54.1