Update changelog for 3.0~beta2.

debian/changelog

 tails (3.0~beta2) UNRELEASED; urgency=medium
 
-  * Dummy entry for next release.
+  * All changes brought by Tails 2.11, except:
+    - the test suite changes, that are not all compatible with this branch;
+    - the "Tails 3.0 will require a 64-bit processor" notification:
+      this advance warning is not useful on a release series
+      that's 64-bit only.
 
- -- intrigeri <tails@boum.org>  Thu, 02 Feb 2017 15:13:50 +0000
+  * Minor improvements
+    - Improve GNOME Shell Window List styling. (Closes: #12233)
+
+  * Bugfixes
+    - Make it possible to start graphical applications in the Root Terminal.
+      (part of #12000)
+
+  * Test suite
+    - Improve robustness when dealing with notifications. (Closes: #11464)
+    - Bump timeout when waiting for 'Tor is ready' notification.
+    - Fix the incremental upgrade test.
+    - Drop a few obsolete test cases, update a number of images.
+    - Adapt firewall leak test to new DHCP source IP address.
+    - Adjust Seahorse and Enigmail tests to the keyserver that is now used.
+
+ -- Tails developers <tails@boum.org>  Wed, 08 Mar 2017 21:13:50 +0000
 
 tails (2.11) unstable; urgency=medium