[gnome-tweak-tool] Copy NEWS from 3.26.4

[Jeremy Bicha <jbicha src gnome org>]

commit 2640fbf405dec6e930369c758470c767693cd444
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Mon Dec 11 13:33:49 2017 -0500

    Copy NEWS from 3.26.4

 NEWS |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index 3076a8e..2507607 100644
--- a/NEWS
+++ b/NEWS
@@ -17,6 +17,21 @@ Translations:
  Khaled Hosney [ar], Marek Cernocky [cs], Tim Sabsch [de],
  Fabio Tomat [fur], gogo [hr], Борисав Живановић [sr]
 
+3.26.4
+======
+New bugfix release.
+
+* Stop requiring a GTK2 theme for Applications theme switcher. (Jeremy)
+* Offer HighContrastInverse theme. (Jeremy)
+* Don't show duplicate theme names. (Jeremy)
+
+Contributors:
+ Jeremy Bicha
+
+Translations:
+ Khaled Hosney [ar], gogo [hr], Hannie Dumoleyn [nl],
+ Борисав Живановић [sr], Kjartan Maraas [nb], Muhammet Kara [tr]
+
 3.26.3
 ======
 New bugfix release.