Mark Tails 3.0.1 as released.

debian/changelog

-tails (3.0.1) UNRELEASED; urgency=medium
+tails (3.0.1) unstable; urgency=medium
 
   * Security fixes
     - Upgrade tor to 0.3.0.9-1~d90.stretch+1 (Closes: #13253).
@@ -31,7 +31,7 @@ tails (3.0.1) UNRELEASED; urgency=medium
     - Print APT sources used in the build VM, to help debugging issues
       such as #12829.
 
- -- Tails developers <tails@boum.org>  Tue, 04 Jul 2017 13:55:08 +0200
+ -- Tails developers <tails@boum.org>  Tue, 04 Jul 2017 15:59:18 +0200
 
 tails (3.0) unstable; urgency=medium