update changelog

debian/changelog

@@ -1,3 +1,11 @@
+apt (0.9.9) unstable; urgency=low
+
+  [ Michael Vogt ]
+  * improve debug output for the Debug::pkgProblemResolver and
+    Debug::pkgDepCache::AutoInstall
+
+ -- Michael Vogt <michael.vogt@ubuntu.com>  Tue, 02 Jul 2013 08:26:17 +0200
+
 apt (0.9.8.2) unstable; urgency=low
 
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