[gimp/gimp-2-10] Updating NEWS added bug resolved whit no commit reference

[Jehan <jehanp src gnome org>]

commit 638ce9a585db9d32c165db71a68df741c37c81ae
Author: lillolollo <4179-lillolollo users noreply gitlab gnome org>
Date:   Fri Nov 29 21:58:57 2019 +0000

    Updating NEWS added bug resolved whit no commit reference

 NEWS | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/NEWS b/NEWS
index 638693d019..083b2f2aed 100644
--- a/NEWS
+++ b/NEWS
@@ -32,7 +32,8 @@ Updated translations:
 
 Bugfixes:
 
-   - #4172, #4194, #4205, #4218, #2543, #4185, #4246, #2794, #4209.
+   - #4172, #4194, #4205, #4218, #2543, #4185, #4246, #2794, #4209,
+     #4278
 
 Developers: