Bump 3.26.0 release

NEWS

+==============
+Version 3.26.0
+==============
+
+Project:
+	* Translation updates
+
 ===============
 Version 3.25.90
 ===============

data/appdata/org.gnome.Todo.appdata.xml.in

@@ -51,6 +51,18 @@
   </kudos>
 
   <releases>
+    <release date="2017-09-11" version="3.26.0">
+      <description>
+        <p>
+          We're proud to annouce GNOME To Do 3.26, the first release in the 3.26 stable
+          series! This release, thanks to the hard work of a Google Summer of Code student,
+          we have synchronization with Todoist in place.
+        </p>
+        <p>This release also updates translations, and adds new translations.</p>
+        <p>Thanks to everyone that contributed to GNOME To Do this cycle!</p>
+      </description>
+    </release>
+
     <release date="2017-08-10" version="3.25.90">
       <description>
         <p>

meson.build

 project(
   'gnome-todo', 'c',
-  version: '3.25.90',
+  version: '3.26.0',
   license: 'GPL3+',
   default_options: [
     'buildtype=debugoptimized',