[glibmm/glibmm-2-56] configure.ac: Require glib-2.0 >= 2.55.1

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 7652602b4882d3267511a9c7fab76703511f009e
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Wed Jul 18 08:39:22 2018 +0200

    configure.ac: Require glib-2.0 >= 2.55.1
    
    and update the bug report address in AC_INIT.
    
    Fixes #29

 configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 23cf5f4c..9e047b6b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,7 +16,7 @@
 ## along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 AC_INIT([glibmm], [2.56.0],
-        [http://bugzilla.gnome.org/enter_bug.cgi?product=glibmm],
+        [https://gitlab.gnome.org/GNOME/glibmm/issues],
         [glibmm], [http://www.gtkmm.org/])
 AC_PREREQ([2.59])
 
@@ -82,7 +82,7 @@ AS_IF([test "x$enable_static" = xyes],
   AC_DEFINE([GIOMM_STATIC_LIB],  [1], [Define if giomm is built as a static library])
 ])
 
-glibreq='2.0 >= 2.50.0'
+glibreq='2.0 >= 2.55.1'
 
 GLIBMM_MODULES="sigc++-2.0 >= 2.9.1 glib-$glibreq gobject-$glibreq gmodule-$glibreq"
 GIOMM_MODULES="$GLIBMM_MODULES gio-$glibreq"