Added missing credit.

git-svn-id: http://svn.zope.org/repos/main/zc.buildout/trunk@87252 62d5b8a3-27da-0310-9561-8e5933582275

CHANGES.txt

@@ -15,7 +15,7 @@ Change History
 - Quote the 'spec' argument, as in the case of installing an egg from
   the buildout-cache, if the filename contains spaces it would fail (sidnei)
 
-- Extended configuration syntax to allow -= and += operators (malthe).
+- Extended configuration syntax to allow -= and += operators (malthe, mustapha).
 
 1.0.3 (2008-06-01)
 ==================