[gtksourceview] release 4.0.3

[Christian Hergert <chergert src gnome org>]

commit 7abe3034d799b757e608fc1ea91dadbf3d036a66
Author: Christian Hergert <chergert redhat com>
Date:   Wed Sep 5 11:33:59 2018 -0700

    release 4.0.3

 NEWS | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/NEWS b/NEWS
index 960aa194..ad1ee735 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,12 @@
+News in 4.0.3, 2018-09-05
+-------------------------
+* New syntax highlighting definition file for: Gradle and Logtalk.
+* Improvements to the syntax highlighting of: JavaScript, LaTeX, Haskell, C++,
+  GLSL, and Markdown.
+* Performance improvements to space drawing.
+* Various memory leak fixes.
+* Translation updates.
+
 News in 4.0.2, 2018-06-17
 -------------------------
 * GtkSourceView has moved to the GNOME GitLab instance. The bugzilla tickets