[pygobject] Update NEWS

[Christoph Reiter <creiter src gnome org>]

commit a9dfe9f021b7f55d726519238c7db6456b6add7b
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Fri Nov 30 21:16:50 2018 +0100

    Update NEWS

 NEWS | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/NEWS b/NEWS
index 0efa5de9..931bf696 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,12 @@
+3.30.4 - 2018-11-30
+-------------------
+
+* gtk overrides: Fix rows getting inserted on the wrong level with
+  TreeStore.insert_before/inster_after if parent=None.
+  :issue:`281` (3.30 regression, thanks to :user:`Cian Wilson <cianwilson>`
+  for the report)
+
+
 3.30.3 - 2018-11-27
 -------------------