[gimp/gimp-2-10] Update NEWS

[Alexandre Prokoudine <aprokoudine src gnome org>]

commit fd14839c816f82324cc218ba60d1a287c5cf64cd
Author: Alexandre Prokoudine <alexandre prokoudine gmail com>
Date:   Fri Jun 22 14:38:33 2018 +0000

    Update NEWS

 NEWS | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/NEWS b/NEWS
index 5a2981990b..74e7908424 100644
--- a/NEWS
+++ b/NEWS
@@ -39,6 +39,12 @@ User Interface:
   - Fonts can now be tagged. The user interface is the same as for brushes,
     patterns etc.
 
+Usability:
+
+  - When a plug-in cannot be applied to an image because of mismatch in image
+    types (e.g. layer has no alpha or image is greyscale), GIMP now displays
+    a message listing supported image types for this plug-in.
+
 Tools:
 
   - The Measurement tool now has an "Auto straighten" option allowing to