[gedit] build: bump gobject-introspection version to 1.42.0

[Sébastien Lafargue <slafargue src gnome org>]

commit c37fd727d2e9617359e6c85d674691b1f5164f73
Author: Sebastien Lafargue <slafargue gnome org>
Date:   Tue Dec 4 23:22:56 2018 +0100

    build: bump gobject-introspection version to 1.42.0
    
    The same version is required by gtksourceview-4,
    use by Gedit.

 README.md    | 2 +-
 configure.ac | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/README.md b/README.md
index 49072ade2..f543dbbd4 100644
--- a/README.md
+++ b/README.md
@@ -64,7 +64,7 @@ gedit requires `GTK+ >= 3.22.0`, `GtkSourceView >= 4.0.2` and
 icon theme for its icons. If gedit fails to display icons, installing
 GNOME's default adwaita-icon-theme is a simple way of providing them.
 
-`PyGObject 3.0.x` and `gobject-introspection 0.9.3` are required to enable
+`PyGObject 3.0.x` and `gobject-introspection 1.42.0` are required to enable
 python plugins support.
 
 `gspell >= 0.2.5` is required to enable the spell checking plugin.
diff --git a/configure.ac b/configure.ac
index 4b61eeccc..44e7c7652 100644
--- a/configure.ac
+++ b/configure.ac
@@ -352,8 +352,7 @@ AM_CONDITIONAL(ENABLE_USER_HELP, test x"$enable_user_help" = "xyes")
 dnl ================================================================
 dnl GObject Introspection
 dnl ================================================================
-
-GOBJECT_INTROSPECTION_CHECK([0.9.3])
+GOBJECT_INTROSPECTION_CHECK([1.42.0])
 
 if test "$found_introspection" = "yes"; then
        enable_introspection=yes