[gimp] Update NEWS

[Alexandre Prokoudine <aprokoudine src gnome org>]

commit 27a20ca1639c2954a9e9a6e49e4c613f2047d556
Author: Alexandre Prokoudine <alexandre prokoudine gmail com>
Date:   Thu Dec 28 04:21:42 2017 +0300

    Update NEWS

 NEWS |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index 7749d84..cdbc0ab 100644
--- a/NEWS
+++ b/NEWS
@@ -31,7 +31,7 @@ Core:
 
 GUI and Usability:
 
-  - New Color Temperature Tool icons: "gimp-tool-color-temperature".
+  - New icons: "gimp-tool-color-temperature" and "gimp-tool-exposure".
 
 Tools:
   - "Link brush size with canvas zoom" paint option becomes "Lock brush