Mark Tails 3.6.2 as released.

debian/changelog

-tails (3.6.2) UNRELEASED; urgency=medium
+tails (3.6.2) unstable; urgency=medium
 
   * Security fixes
     - Upgrade Tor Browser to 7.5.3 (MFSA 2018-10, Closes: #15459).
@@ -31,7 +31,7 @@ tails (3.6.2) UNRELEASED; urgency=medium
     - Fix issue where the tails-persistence-setup user's guid would be
       changed when it was the uid that was intended (Closes: #15422).
 
- -- Tails developers <tails@boum.org>  Thu, 29 Mar 2018 13:41:26 +0200
+ -- Tails developers <tails@boum.org>  Thu, 29 Mar 2018 17:49:42 +0200
 
 tails (3.6.1) unstable; urgency=medium