[gnome-software/gnome-3-26] Release version 3.26.6

[Kalev Lember <klember src gnome org>]

commit 16585115a93f20560d08bc5f53b3ca123174c650
Author: Kalev Lember <klember redhat com>
Date:   Thu Feb 8 13:11:31 2018 +0100

    Release version 3.26.6

 NEWS                                           | 17 +++++++++++++++++
 data/appdata/org.gnome.Software.appdata.xml.in | 19 +++++++++++++++++++
 2 files changed, 36 insertions(+)
---
diff --git a/NEWS b/NEWS
index e5bb78ea..03ae5d85 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,20 @@
+Version 3.26.6
+~~~~~~~~~~~~~~
+Released: 2018-02-08
+
+This is a stable release with the following changes:
+ * Improve alignment on the updates page
+ * Do not show missing screenshot error for fonts that have screenshots
+ * Fixes for third party repository handling in the sources dialog
+ * Fix various issues on Ubuntu when purchasing apps
+ * Fix building with gtkspell support
+ * Fix an issue that led to duplicate categories appearing on the overview page
+ * Various memory leak and correctness fixes
+ * Show package descriptions when installing packages through the dbus API
+ * Revert a commit that broke repo package install
+
+This release also updates translations.
+
 Version 3.26.5
 ~~~~~~~~~~~~~~
 Released: 2018-01-08
diff --git a/data/appdata/org.gnome.Software.appdata.xml.in b/data/appdata/org.gnome.Software.appdata.xml.in
index c149200e..deb53052 100644
--- a/data/appdata/org.gnome.Software.appdata.xml.in
+++ b/data/appdata/org.gnome.Software.appdata.xml.in
@@ -46,6 +46,25 @@
    Validate with `appstream-util validate *.appdata.xml`
   -->
   <releases>
+    <release date="2018-02-08" version="3.26.6">
+      <description>
+        <p>
+          This is a stable release with the following changes:
+        </p>
+        <ul>
+          <li>Improve alignment on the updates page</li>
+          <li>Do not show missing screenshot error for fonts that have screenshots</li>
+          <li>Fixes for third party repository handling in the sources dialog</li>
+          <li>Fix various issues on Ubuntu when purchasing apps</li>
+          <li>Fix building with gtkspell support</li>
+          <li>Fix an issue that led to duplicate categories appearing on the overview page</li>
+          <li>Various memory leak and correctness fixes</li>
+          <li>Show package descriptions when installing packages through the dbus API</li>
+          <li>Revert a commit that broke repo package install</li>
+        </ul>
+        <p>This release also updates translations.</p>
+      </description>
+    </release>
     <release date="2018-01-08" version="3.26.5">
       <description>
         <p>