Add missing changelog entry for new trigger directives

debian/changelog

@@ -50,6 +50,8 @@ dpkg (1.16.1) UNRELEASED; urgency=low
   * dpkg: if "prerm upgrade" fails when downgrading, do not try to run
     "prerm failed-upgrade" with the prerm of the oldest prerm, it can't work
     around a bug of a newer prerm anyway.
+  * dpkg: support new "interest-noawait" and "activate-noawait" trigger
+    directives.
 
   [ Guillem Jover ]
   * Install deb-src-control(5) man pages in dpkg-dev. Closes: #620520