Mark Tails 3.14.2 as released.

debian/changelog

-tails (3.14.2) UNRELEASED; urgency=medium
+tails (3.14.2) unstable; urgency=medium
 
   * Security fixes
     - Upgrade Tor Browser to 8.5.3 (Closes: #16835).
@@ -7,7 +7,7 @@ tails (3.14.2) UNRELEASED; urgency=medium
     - tails-screen-locker: Don't use dim-label style class
       (Closes: #16802).
 
- -- Tails developers <tails@boum.org>  Sun, 23 Jun 2019 10:41:51 +0200
+ -- Tails developers <tails@boum.org>  Sun, 23 Jun 2019 11:52:49 +0200
 
 tails (3.14.1) unstable; urgency=medium