debian/changelog: updated credits

debian/changelog

@@ -1,7 +1,8 @@
 apt (0.7.7) UNRELEASED; urgency=low
 
   * apt-inst/contrib/extracttar.cc:
-    - fix fd leak for zero size files 
+    - fix fd leak for zero size files (thanks to Bill Broadley for
+      reporting this bug)
 
  -- Michael Vogt <michael.vogt@ubuntu.com>  Thu, 02 Aug 2007 11:55:54 +0200