[gnome-desktop] Add NEWS for release

[Michael Catanzaro <mcatanzaro src gnome org>]

commit c1405c448e170740cc21ecb3d86a801aa6848be0
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Fri Feb 9 20:41:18 2018 -0600

    Add NEWS for release

 NEWS |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index 51112c4..3be6a91 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,12 @@
 ===============
+Version 3.27.90
+===============
+
+- Miscellaneous improvements to the thumbnailer code
+- Remove unused gnome_desktop_thumbnail_has_uri()
+- Replace GdkColor methods with GdkRGBA methods
+
+===============
 Version 3.27.2
 ===============