Mark Tails 3.0~beta1 as released.

debian/changelog

-tails (3.0~beta1) UNRELEASED; urgency=medium
+tails (3.0~beta1) experimental; urgency=medium
 
   * All changes brought by Tails 2.7.1, 2.9.1 and 2.10.
 
@@ -109,7 +109,7 @@ tails (3.0~beta1) UNRELEASED; urgency=medium
     - Update extensions.enigmail.configuredVersion.
     - Remove the jessie-proposed-updates APT sources.
 
- -- Tails developers <tails@boum.org>  Wed, 01 Feb 2017 17:32:51 +0000
+ -- Tails developers <tails@boum.org>  Wed, 01 Feb 2017 19:23:03 +0000
 
 tails (2.10) unstable; urgency=medium