Update changelog for 0.20.

debian/changelog

-tails (0.20) UNRELEASED; urgency=low
+tails (0.20~rc1) unstable; urgency=low
 
-  * Upcoming release.
+  * Major new features
+  - Install Linux kernel 3.10.3-1 from Debian unstable.
+
+  * Bugfixes
+  - Prevent Iceweasel from displaying a warning when leaving HTTPS web sites.
+  - Make Iceweasel use the correct, localized search engine.
+  * Fix Git access to https:// repositories.
+
+  * Minor improvements
+  - Install Dasher, a predictive text entry tool.
+  - Add a wrapper around TrueCrypt which displays a warning about it soon
+    being deprecated in Tails.
+  - Remove Pidgin libraries for all protocols but IRC and Jabber/XMPP.
+    Many of the other protocols Pidgin support are broken in Tails and
+    haven't got any security auditting.
+  - Disable the pre-defined Pidgin accounts so they do not auto-connect
+    on Pidgin start.
+  - Include information about Alsa in WhisperBack reports.
+  - Restrict access to ptrace. While this setting was enabled by default in
+    Debian's Linux 3.9.6-1, it will be disabled in 3.9.7-1, so let's
+    re-enable it ourselves explicitly.
+  - Do not display dialog when a message is sent in Claws Mail.
+
+  * Localization
+  - Many translation updates all over the place.
+  - Merge all Tails-related POT files into one, and make us of intltoolize
+    for better integration with Transifex.
 
- -- Tails developers <tails@boum.org>  Mon, 24 Jun 2013 10:40:33 +0200
+ -- Tails developers <tails@boum.org>  Tue, 30 Jul 2013 14:19:57 +0200
 
 tails (0.19) unstable; urgency=low