[librsvg/librsvg-2.46] Update NEWS

[Federico Mena Quintero <federico src gnome org>]

commit cd4f205391a8c8e22591eca5d7d8c3dde25fd052
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Oct 15 12:29:50 2019 -0500

    Update NEWS

 NEWS | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/NEWS b/NEWS
index 860ac015..388610ee 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,11 @@
+Version 2.46.3
+
+- #516 - Fix inadvertent bump in the minimum Rust version required.  The
+  string_cache crate is now pinned to a version that still works on
+  Rust 1.34.  (Jordan Petridis)
+
+- #308 - Fix stack exhaustion with circular references in <use> elements.
+
 Version 2.46.2
 
 - Patterns and gradients reused across more than one element will only