Update 2.7 changelog with last #11846 merge.

debian/changelog

@@ -16,6 +16,8 @@ tails (2.7) UNRELEASED; urgency=medium
     - Test incremental upgrades. (Closes: #6309)
     - Decrease timeout to Tails Greeter to speed up testing of branches
       where it is broken. (Closes: #11449)
+    - Add a ID field to the remote shell responses to filter out
+      unrelated ones. (Closes: #11846)
 
  -- Tails developers <tails@boum.org>  Mon, 03 Oct 2016 23:06:51 +0200