[gtksourceview] Bump GTK+ requirement

[Sébastien Wilmet <swilmet src gnome org>]

commit effcee17cf983173b641dcce211ff5eec6ee5a6b
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Thu Nov 26 12:11:29 2015 +0100

    Bump GTK+ requirement
    
    For the GTK+ styling changes.

 README       |    2 +-
 configure.ac |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/README b/README
index 66629c7..63a5f3d 100644
--- a/README
+++ b/README
@@ -29,7 +29,7 @@ the GNU Lesser General Public License.
 Installation
 ============
 
-GtkSourceView requires GLib >= 2.47.0, GTK+ >= 3.19.0 and libxml2 >= 2.6.
+GtkSourceView requires GLib >= 2.47.0, GTK+ >= 3.19.3 and libxml2 >= 2.6.
 
 Simple install procedure:
 
diff --git a/configure.ac b/configure.ac
index d76b278..ef83b17 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,7 +45,7 @@ AC_SUBST(GSV_LT_VERSION)
 
 # Dependencies
 glib_req=2.47.0
-gtk_req=3.19.0
+gtk_req=3.19.3
 libxml_req=2.6.0
 gladeui_req=3.9