prepare 0.7.20 upload

debian/changelog

@@ -32,7 +32,7 @@ apt (0.7.20) UNRELEASED; urgency=low
     - Vietnamese updated. Closes: #509422
     - Traditional Chinese added. Closes: #510664
 
- -- Eugene V. Lyubimkin <jackyf.devel@gmail.com>  Sat, 06 Dec 2008 20:57:00 +0200
+ -- Michael Vogt <michael.vogt@ubuntu.com>  Mon, 05 Jan 2009 08:59:20 +0100
 
 apt (0.7.20~exp2) unstable; urgency=low