Update changelog for 3.1.

debian/changelog

 tails (3.1) UNRELEASED; urgency=medium
 
-  * Dummy entry for next release.
+  * Security fixes
+    - Upgrade Tor Browser to 7.0.4-build1 (Closes: #13577).
+    - Upgrade libtiff to 4.0.8-2+deb9u1.
+    - Upgrade bind9 to 1:9.10.3.dfsg.P4-12.3+deb9u2.
+    - Upgrate evince to 3.22.1-3+deb9u1.
+    - Upgrade imagemagick 8:6.9.7.4+dfsg-11+deb9u1.
+    - Ensure Thunderbird cleans its temporary directory. (Closes: #13340).
+
+  * Minor improvements
+    - Patch gconf to produce reproducible XML output (refs: #12738). This is
+      the temporary solution for #12738 in Tails 3.1 which will be reverted
+      (and fixed permanently by removing gconf) in Tails 3.2.
+    - Apply Debian bts patch to cracklib to produce reproducible dictionnaries
+      (Closes: #12909).
+    - Upgrade to Debian 9.1 (Closes: #13178).
+
+  * Bugfixes
+    - Replace faulty URL in htpdate neutral pool (Closes: #13472).
+    - Keep installing a version of Enigmail compatible with Thunderbird 45.x
+      (Closes: #13530).
+    - Fix the time syncing and Tor notifications translations (Closes: #13437).
+
+  * Build system
+    - Upgrade the Vagrant basebox for building ISO images to Stretch
+      (Closes: #11738).
+    - Fix on-disk build by bumping Vagrant build VM memory to 768M
+      (Closes: #13480).
+    - Fix rescue build option by exporting TAILS_BUILD_FAILURE_RESCUE
+      (Closes: #13476).
+
+  * Test suite
+    - mark gnome screenshot scenario as fragile (refs: #13458)
+    - mark UEFI scenario as fragile (refs: #13459).
 
- -- Tails developers <tails@boum.org>  Wed, 05 Jul 2017 19:28:52 +0000
+ -- Tails developers <tails@boum.org>  Sat, 05 Aug 2017 12:49:11 +0200
 
 tails (3.0.1) unstable; urgency=medium