[gnome-builder] Bump GObject-Introspection requirement

[Garrett Regier <gregier src gnome org>]

commit 15a9290363efd114afa82f943310fa07c1fad73c
Author: Garrett Regier <garrettregier gmail com>
Date:   Wed May 13 11:31:52 2015 -0700

    Bump GObject-Introspection requirement
    
    This is required for nullable

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 6a4f68f..8e6d119 100644
--- a/configure.ac
+++ b/configure.ac
@@ -256,7 +256,7 @@ GLIB_GSETTINGS
 dnl ***********************************************************************
 dnl Setup Introspection
 dnl ***********************************************************************
-GOBJECT_INTROSPECTION_CHECK([1.30.0])
+GOBJECT_INTROSPECTION_CHECK([1.42.0])
 
 
 dnl ***********************************************************************