revert update status changelog message, 'update' module is not yet in Drupal...

revert update status changelog message, 'update' module is not yet in Drupal core, but this change slipped in with http://drupal.org/cvs?commit=71956

CHANGELOG.txt

@@ -61,7 +61,6 @@ Drupal 6.0, xxxx-xx-xx (development version)
 - Added support for configurable actions.
 - Made user profiles easier to theme by using array rendering and supplying template files.
 - Added Deletion API to allow modules to alter and respond to any delete operation.
-- Added the Update status module to automatically check for available updates and warn sites if they are missing security updates or newer versions.
 
 Drupal 5.0, 2007-01-15
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