[json-glib] build: Bump up the requirement for gtk-doc

[Emmanuele Bassi <ebassi src gnome org>]

commit ff018d7e560278d65a03c4de71c3cf11b22d3167
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Mar 4 18:30:31 2014 +0000

    build: Bump up the requirement for gtk-doc

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f3a3dc4..48be298 100644
--- a/configure.ac
+++ b/configure.ac
@@ -263,7 +263,7 @@ AM_CONDITIONAL(ENABLE_GCOV, test "x$use_gcov" = "xyes")
 
 dnl === Documentation =========================================================
 
-GTK_DOC_CHECK([1.13], [--flavour no-tmpl])
+GTK_DOC_CHECK([1.20], [--flavour no-tmpl])
 
 AC_ARG_ENABLE([man,],
               [AS_HELP_STRING([--enable-man], [generate man pages @<:@default=auto@:>@])],