update changelog

debian/changelog

@@ -10,6 +10,7 @@ apt (0.9.13.1) UNRELEASED; urgency=low
   * add autopkgtest support for the integration testsuite
   * merge mvo/feature/short-list
   * merge mvo/feature/edit-sources
+  * fix segfault in pkgDepCache::SetCandidateRelease() (closes: #709560)
 
  -- Michael Vogt <mvo@debian.org>  Thu, 28 Nov 2013 20:02:39 +0100