[gtksourceview] Increase GTK_REQUIRED_VERSION to 3.15.3 (for GtkTextExtendSelection)

[Adam Dingle <adamd src gnome org>]

commit d84583c106d56f82a3c7163d830ddc251503e4db
Author: Adam Dingle <adam medovina org>
Date:   Sun Dec 28 18:35:52 2014 -0500

    Increase GTK_REQUIRED_VERSION to 3.15.3 (for GtkTextExtendSelection)

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 1b0a8f2..697b85a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,7 +36,7 @@ AC_SUBST(GSV_LT_VERSION)
 
 # Dependencies
 GLIB_REQUIRED_VERSION=2.43.1
-GTK_REQUIRED_VERSION=3.15.0
+GTK_REQUIRED_VERSION=3.15.3
 LIBXML_REQUIRED_VERSION=2.6.0
 GLADE_UI_REQUIRED=3.9