Update changelog for 0.20.1.

debian/changelog

-tails (0.20.1~rc1) unstable; urgency=low
+tails (0.20.1) unstable; urgency=low
 
   * Major new features
   - Install Tor 0.2.4.x from the Tor project's repository.
@@ -42,7 +42,7 @@ tails (0.20.1~rc1) unstable; urgency=low
   - Remove custom persistence test from manual test suite.
     It was removed for the GUI in t-p-s 0.33.
 
- -- Tails developers <tails@boum.org>  Mon, 09 Sep 2013 12:42:50 +0200
+ -- Tails developers <tails@boum.org>  Sun, 15 Sep 2013 15:49:36 +0200
 
 tails (0.20) unstable; urgency=low