[gimp] NEWS: mention that we now almost always create layer in NORMAL mode

[Michael Natterer <mitch src gnome org>]

commit e34ce3b269d16274c0931567d640d5299c9ced79
Author: Michael Natterer <mitch gimp org>
Date:   Tue Aug 22 19:32:09 2017 +0200

    NEWS: mention that we now almost always create layer in NORMAL mode

 NEWS |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index 6222aa6..c66565b 100644
--- a/NEWS
+++ b/NEWS
@@ -47,6 +47,9 @@ Layers and compositing:
     or CIE LAB.
   - Layer blending color space and compositing color space are
     configurable now.
+  - Layers created from the GUI and from plug-ins now default to
+    normal mode (not normal-legacy), unless all the existing layers
+    in the image are also in legacy mode.
   - New layer modes: linear burn, vivid light, linear light, pin light,
     hard mix, exclusion, merge, split, luminance (rgb), pass-through
     (for layer groups only).