[glibmm] Created tag 2.57.1

[Kjell Ahlstedt <kjellahl src gnome org>]

The unsigned tag '2.57.1' was created.

Tagger: Kjell Ahlstedt <kjellahlstedt gmail com>
Date: Mon Mar 26 12:32:25 2018 +0200

    2.57.1

Changes since the last tag '2.55.2':

Kjell Ahlstedt (6):
      Gio::DataOutputStream::put_string(): Don't pass std:string by value
      convert_glib.m4: Remove some unusued conversions
      Glib::OptionEntry: Use _MEMBER_SET_STR where possible
      Glib, Gio: Regenerate docs.xml and .defs files
      Change the ABI to glibmm-2.58
      2.57.1

Pavlo Solntsev (1):
      member.m4: Add _MEMBER_SET_STR, setter for strings