Changelog entry for Dpkg::Interface::Storable introduction

debian/changelog

@@ -13,6 +13,8 @@ dpkg (1.15.6) UNRELEASED; urgency=low
     - update Dpkg::Compression's API to use compression_* functions
       instead of granting direct access to variables, integrate
       there management of default compression
+    - introduce Dpkg::Interface::Storable and update many modules
+      to make use of it
   * Drop debian-maintainers from Suggests since it's obsolete, the
     corresponding keyring is in debian-keyring.
   * Merge support of symbol patterns in dpkg-gensymbols. Thanks to