[gobject-introspection] Bump version to 1.55.0

[Rico Tzschichholz <ricotz src gnome org>]

commit a2e9c747da6a889fe7bbfa2481c8890cc4251484
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Thu Oct 5 09:26:57 2017 +0200

    Bump version to 1.55.0

 configure.ac |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a5f488a..541a102 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,8 +3,8 @@
 
 dnl the gi version number
 m4_define(gi_major_version, 1)
-m4_define(gi_minor_version, 54)
-m4_define(gi_micro_version, 1)
+m4_define(gi_minor_version, 55)
+m4_define(gi_micro_version, 0)
 m4_define(gi_version, gi_major_version.gi_minor_version.gi_micro_version)
 
 AC_PREREQ([2.63])
@@ -128,7 +128,7 @@ GIR_DIR="$EXPANDED_DATADIR/$GIR_SUFFIX"
 AC_SUBST(GIR_DIR)
 AC_DEFINE_UNQUOTED(GIR_DIR, "$GIR_DIR", [Director prefix for gir installation])
 
-PKG_CHECK_MODULES(GLIB, [glib-2.0 >= 2.54.0])
+PKG_CHECK_MODULES(GLIB, [glib-2.0 >= 2.55.0])
 
 PKG_CHECK_MODULES(GOBJECT, [gobject-2.0])
 PKG_CHECK_MODULES(GMODULE, [gmodule-2.0])