Update changelog.

debian/changelog

@@ -6,6 +6,11 @@ tails (3.0~beta2) UNRELEASED; urgency=medium
       this advance warning is not useful on a release series
       that's 64-bit only.
 
+  * Major new features and changes
+    - Upgrade to a new snapshot of the Debian APT repositories (2017030802),
+      and of the Torproject ones (2017030801).
+    - Upgrade Linux to 4.9.0-2 (version 4.9.13-1).
+
   * Minor improvements
     - Improve GNOME Shell Window List styling. (Closes: #12233)