[librsvg: 1/4] Update NEWS

[Marge Bot <marge-bot src gnome org>]

commit 7a063a96ad818117576a37ab350088d52285a3a8
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri Jul 9 18:21:08 2021 -0500

    Update NEWS
    
    Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/567>

 NEWS | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
---
diff --git a/NEWS b/NEWS
index db45d2d6..9e47ec64 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,25 @@
+==============
+Version 2.51.4
+==============
+
+- #618 - SVG2: Implement context-fill and context-stroke for markers
+  (Madds H).
+
+- #727 - SVG2: Implement paint-order for text elements (Madds H).
+
+- #747 - SVG2: Support width="auto" and height="auto" for the image element.
+
+- Fix the Windows build (Chun-wei Fan).
+
+- The tools/docker directory now has scripts that developers can use
+  to test librsvg on containers for various Linux distributions.
+
+- Gtk-rs dependency is updated to 0.14.0 (Bilal Elmoussaoui, Chun-wei Fan).
+
+- #758 - Panic when rendering with masks or opacity to a non-image surface.
+
+- #757 - Fix 32-bit builds.
+
 ==============
 Version 2.51.3
 ==============