[gimp] NEWS: more updates

[Michael Natterer <mitch src gnome org>]

commit ff82b3779c09745ac96fc709469896a3ef7fa9cd
Author: Michael Natterer <mitch gimp org>
Date:   Tue Apr 17 21:21:33 2018 +0200

    NEWS: more updates

 NEWS |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index 70e4f5f..9bdd91c 100644
--- a/NEWS
+++ b/NEWS
@@ -28,6 +28,10 @@ Core:
     data.
   - Plug-ins debugging on crashes through --stack-trace-mode CLI option
     improved to handle more case.
+  - Fix selection -> channel -> selection roundtrips by never doing
+    any gamma conversion when converting between an image's selection,
+    channels, masks. Also, make all channels linear in all images with
+    >8bit.
 
 Libgimp: