[gtksourceview] build: bump deps version numbers to stable versions

[Sébastien Wilmet <swilmet src gnome org>]

commit 24b341666d813e677f5550e86f9764a4228ec6c8
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun May 8 17:17:37 2016 +0200

    build: bump deps version numbers to stable versions
    
    It's better to install the stable versions.
    
    And simplify libxml version number.

 configure.ac |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 4384564..ff5d11d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -44,9 +44,9 @@ GSV_LT_VERSION="$GSV_LT_CURRENT:$GSV_LT_REVISION:$GSV_LT_AGE"
 AC_SUBST(GSV_LT_VERSION)
 
 # Dependencies
-glib_req=2.47.0
-gtk_req=3.19.6
-libxml_req=2.6.0
+glib_req=2.48
+gtk_req=3.20
+libxml_req=2.6
 gladeui_req=3.9
 
 AC_CONFIG_SRCDIR([gtksourceview/gtksourcebuffer.h])