correct Maarten's email address.

git-svn-id: http://root.cern.ch/svn/root/trunk@4369 27541ba8-7e3a-0410-8455-c3a389f83636

README/CREDITS

@@ -11,7 +11,7 @@ PS: please let us know if you are not on this list while you should be, or
 
 -------------------
 N: Maarten Ballintijn
-E: maartenb@xs4all.nl
+E: maartenb@mit.edu
 D: initial linux port
 D: PROOF development