Add missing changelog entry.

debian/changelog

@@ -16,6 +16,7 @@ tails (1.3~rc1) unstable; urgency=medium
     - Always pass arguments through wrappers (connect-socks, totem,
       wget, whois) with "$@". $* doesn't handle arguments with
       e.g. embedded spaces correctly. (Closes: #8603, #8830)
+    - Upgrade Linux to 3.16.7-ckt4-3.
 
   * Minor improvements
     - Install a custom-built Tor package with Seccomp enabled;